Replacing my old 305 with a factory new 350…things to watch for?
Question:
The subject says it. I have a full sized 85 GMC Jimmy that I am going to have the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. Thankfully my current engine hasn’t blown up or anything so I am going to have plenty of time to shop around and find a good deal. Here is my question…what are some -important- things I should ask about or watch out for? I’ve never had anything this major done to my truck, and I’m not really a mechanic myself. I just want to make sure I can atleast ask the right questions when I’m shopping for a decent price etc. BTW, can anyone in the Portland/Vancouver area suggest a good shop I ought to check out? Anyway, ANY and all help/info would be -greatly- appreciated. Obviously because of the expense involved this is NOT the kind of thing someone wants to screw up. =O Thanks in advance! Jason — Surf the www alot? Want to get paid for it? Sign up is free! Join today! http://www.gotoworld.com/getpaid/default.asp?rid=1017072207
Response:
> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc.
A 305 and 350 is basically the same thing. They both have the same external dimensions and everything should mount up the same. I don’t see anything wrong with a 305. A 350 is basically a 305 with some slightly different internals to bump up the compression ratio.
Response:
FWIW, I would make certain that the computer can handle the increased displacement. I have heard of some who have swapped bumped their 350’s to 383 and the computer could not handle that little bit of displacement increase. At idle the truck would idle very poorly. I assume a real lean condition. You may not have the same problem if yours is not TBI (maybe you have an electronic Q-Jet?), but you may want to check. The condition that I am describing happened on the 90’s series TBI trucks. Just a thought, Tom Trezek – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. > BTW, can anyone in the Portland/Vancouver area suggest a good shop I ought to > check out? > Anyway, ANY and all help/info would be -greatly- appreciated. Obviously > because of the expense involved this is NOT the kind of thing someone wants to > screw up. =O Thanks in advance! > Jason > — > Surf the www alot? Want to get paid for it? Sign up is free! > Join today! > http://www.gotoworld.com/getpaid/default.asp?rid=1017072207
Response:
Get a warranty in writing in English or whatever your favorite language is. I replaced one 305 with another and when the transmission went one month later I had that replaced. Ahhh my problems are over only problem is 1,000 miles later the motor blew a head gasket and the mechanic was pointing the finger at the transmission shop.Once the second new 305 was in {after fighting with oh we just need to put a head gasket and change the oil} the transmission started slipping in third. The transmission guy wanted to go buy the 90 day deal I told him between the two shops I drove the thing about one week. Then he started pointing to the guy who put the motor in.Now I am hooked up and the thing seems to be ok. Once again get it in writing not saying the people I delt with were trying to screw me but when the shit hit the fan everyone was doing a lot of talking and not a whole lot of wrench spinning once the check cleared. GOOD LUCK BTW the 305 is not very powerful in my jimmy I wish I put in a 350 – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. > BTW, can anyone in the Portland/Vancouver area suggest a good shop I ought to > check out? > Anyway, ANY and all help/info would be -greatly- appreciated. Obviously > because of the expense involved this is NOT the kind of thing someone wants to > screw up. =O Thanks in advance! > Jason > — > Surf the www alot? Want to get paid for it? Sign up is free! > Join today! > http://www.gotoworld.com/getpaid/default.asp?rid=1017072207
Response:
The only difference is the 350 has a 4" bore (piston diameter), whereas the 305 has a 3.75". I asked a local speed shop about this (a friend of mine has a TBI 305 in his ‘87 Chevy and was thinking about doing the same thing.) The speed shop guy said mechanically, it wasn’t a problem. What he said would be different would be fuel consumption. The stock 305 TBI wouldn’t be able to supply enough fuel at high RPM’s (3000 RPM +). Not a problem though, as you can easily swap it out. If your 305 has a carb on it, then it’s just a matter of rejetting to handle the additional air consumption. – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. > A 305 and 350 is basically the same thing. They both have the same external > dimensions and everything should mount up the same. I don’t see anything wrong > with a 305. A 350 is basically a 305 with some slightly different internals to > bump up the compression ratio.
– Lyle Pakula
Response:
We have done plenty of them including the stroker motors and roller motors. A search for a prom update or speed dens is common protocol. David – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same external >dimensions and everything should mount up the same. I don’t see anything wrong >with a 305. A 350 is basically a 305 with some slightly different internals to >bump up the compression ratio.
Response:
Actually…a 350 has more cubic inches than a 305 and 9 times out of 10 it is CHEAPER to go with a 350..as they are the one of the most common engines in the country. More cubic inches means more HP and Torque ( your engine does not have to work as hard to pull your truck around ) A NEW…GM warranted ( 12mo 12k miles ) 350 complete engine can be had for around $1200 or so… Do a search on the net for Jim Pace parts…they are VERY reasonable. On the warranty, GM will pay the labor to remove / install the engine if it craps out during the warranty. WELL WORTH the money IMHO. HTH
– Hide quoted text — Show quoted text ->We have done plenty of them including the stroker >motors and roller motors. A search for a prom >update or speed dens is common protocol. >David >> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have >> the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. >> Thankfully my current engine hasn’t blown up or anything so I am going to have >> plenty of time to shop around and find a good deal. Here is my question…what >> are some -important- things I should ask about or watch out for? I’ve never >> had anything this major done to my truck, and I’m not really a mechanic >> myself. I just want to make sure I can atleast ask the right questions when >> I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same external >dimensions and everything should mount up the same. I don’t see anything wrong >with a 305. A 350 is basically a 305 with some slightly different internals to >bump up the compression ratio.
Response:
If you really want to get some go, but you will have to spend some extra money, you can get the 330 HP 350 crate engine, part # 1286041. If you were ever planning on a HP increase now would be the time.<g> If you are in Canada, the old targetmaster engines have a 36 mo/80,000 km warranty, including parts and labour if installed at a GM shop. Something that you could do is to have a few mechanics do a written quote for you on the job to be done, especially if the truck is still driveable. – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. > BTW, can anyone in the Portland/Vancouver area suggest a good shop I ought to > check out? > Anyway, ANY and all help/info would be -greatly- appreciated. Obviously > because of the expense involved this is NOT the kind of thing someone wants to > screw up. =O Thanks in advance! > Jason > — > Surf the www alot? Want to get paid for it? Sign up is free! > Join today! > http://www.gotoworld.com/getpaid/default.asp?rid=1017072207
Response:
eh? Compression ratio??? then it wouldn’t be a 350 then would it? It would be a 305 with higher compression the way you’ve stated it,correct? bigger bore FHLH www.teamrocs.com www.funkymonkey.net/fhlh www.tx4×4.com – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same external >dimensions and everything should mount up the same. I don’t see anything wrong >with a 305. A 350 is basically a 305 with some slightly different internals to >bump up the compression ratio.
Response:
bore and stroke are the difference
– Hide quoted text — Show quoted text -> eh? Compression ratio??? then it wouldn’t be a 350 then would it? It would > be a 305 with higher compression the way you’ve stated it,correct? bigger > bore > FHLH > www.teamrocs.com > www.funkymonkey.net/fhlh > www.tx4×4.com >> The subject says it. I have a full sized 85 GMC Jimmy that I am going to > have >> the 305 yanked from and a brand-spankin’ factory-new 350 put in its > place. >> Thankfully my current engine hasn’t blown up or anything so I am going to > have >> plenty of time to shop around and find a good deal. Here is my > question…what >> are some -important- things I should ask about or watch out for? I’ve > never >> had anything this major done to my truck, and I’m not really a mechanic >> myself. I just want to make sure I can atleast ask the right questions > when >> I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same > external >dimensions and everything should mount up the same. I don’t see anything > wrong >with a 305. A 350 is basically a 305 with some slightly different > internals to >bump up the compression ratio.
Response:
> bore and stroke are the difference
Actually, just the bore. The Crankshafts in the 305 and 350 are nearly identical (they even have the same casting numbers…) although there is a slight difference to the geometry of the 305 crankshaft.
Response:
My question would be would the computer and fuel control be able to handle the different engine.
Response:
305/350 Chevy=3.48 stoke. See my post above but, most ECM’s do not have any problem. David – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same external >dimensions and everything should mount up the same. I don’t see anything wrong >with a 305. A 350 is basically a 305 with some slightly different internals to >bump up the compression ratio.
Response:
Chevrolet offers a new(not rebuilt)350/210 horsepower 4 bolt main engine for around $1,250.00.I have seen them advertised in many Chevy magazines.If you can`t find one call Kilpatrick Chevrolet,Boaz,Alabama and ask for Maurice in parts.They had them last spring,and should still be available.Why pay good money for a crappy rebuilt when you can buy new?
– Hide quoted text — Show quoted text ->305/350 Chevy=3.48 stoke. >See my post above but, most >ECM’s do not have any problem. >David >> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have >> the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. >> Thankfully my current engine hasn’t blown up or anything so I am going to have >> plenty of time to shop around and find a good deal. Here is my question…what >> are some -important- things I should ask about or watch out for? I’ve never >> had anything this major done to my truck, and I’m not really a mechanic >> myself. I just want to make sure I can atleast ask the right questions when >> I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same external >dimensions and everything should mount up the same. I don’t see anything wrong >with a 305. A 350 is basically a 305 with some slightly different internals to >bump up the compression ratio.
Response:
http://www.sallee-chevrolet.com/
– Hide quoted text — Show quoted text -> Chevrolet offers a new(not rebuilt)350/210 horsepower 4 bolt main engine for > around $1,250.00.I have seen them advertised in many Chevy magazines.If you > can`t find one call Kilpatrick Chevrolet,Boaz,Alabama and ask for Maurice in > parts.They had them last spring,and should still be available.Why pay good > money for a crappy rebuilt when you can buy new? >305/350 Chevy=3.48 stoke. >See my post above but, most >ECM’s do not have any problem. >David >>> The subject says it. I have a full sized 85 GMC Jimmy that I am going to > have >>> the 305 yanked from and a brand-spankin’ factory-new 350 put in its > place. >>> Thankfully my current engine hasn’t blown up or anything so I am going > to have >>> plenty of time to shop around and find a good deal. Here is my > question…what >>> are some -important- things I should ask about or watch out for? I’ve > never >>> had anything this major done to my truck, and I’m not really a mechanic >>> myself. I just want to make sure I can atleast ask the right questions > when >>> I’m shopping for a decent price etc. >>A 305 and 350 is basically the same thing. They both have the same > external >>dimensions and everything should mount up the same. I don’t see anything > wrong >>with a 305. A 350 is basically a 305 with some slightly different > internals to >>bump up the compression ratio.
Response:
I have an 86 with a four speed manual. I love it. I didn”t like it at first but now I wouldn’t trade it for anything. The performance is definetly there with my 305. I also have a 350 that is rebuilt, mine was pulled from a 71 Chevelle/Monte Carlo. I was waiting until my 305 dies to do the swap. So far we’ve put over 40,000 on the truck and it’s stronger now then when I bought it. Of course we’ve gone through three clutches, an exhaust system, a carburator and a feul pump but that’s another story. Stephen – Hide quoted text — Show quoted text – >I have a 84 Blazer that has had the 305 removed and a 350 put it’s place . >wouldn’t have it any other way. >not knowing this at the time I bought it decided to rebuild it myself . Ran >the numbers on the block and found out it was a 74 Corvette >ngine( definetly time to do a little over kill ) >. The only thing I didn’t >like after the rebuild was the Trans. didn’t work too well ( 4 speed auto. ) >had to change to a Th 350 to get the performance I was looking for ( towing >and off road capabilities ) IF you have the 4 Speed Auto and you plan to be >a little rough with the truck you might want to think about a tranny swap as >well. could ask for a better runing off road setup.
Response:
http://www.sallee-chevrolet.com/
– Hide quoted text — Show quoted text -> Chevrolet offers a new(not rebuilt)350/210 horsepower 4 bolt main engine for > around $1,250.00.I have seen them advertised in many Chevy magazines.If you > can`t find one call Kilpatrick Chevrolet,Boaz,Alabama and ask for Maurice in > parts.They had them last spring,and should still be available.Why pay good > money for a crappy rebuilt when you can buy new? >305/350 Chevy=3.48 stoke. >See my post above but, most >ECM’s do not have any problem. >David >>> The subject says it. I have a full sized 85 GMC Jimmy that I am going to > have >>> the 305 yanked from and a brand-spankin’ factory-new 350 put in its > place. >>> Thankfully my current engine hasn’t blown up or anything so I am going > to have >>> plenty of time to shop around and find a good deal. Here is my > question…what >>> are some -important- things I should ask about or watch out for? I’ve > never >>> had anything this major done to my truck, and I’m not really a mechanic >>> myself. I just want to make sure I can atleast ask the right questions > when >>> I’m shopping for a decent price etc. >>A 305 and 350 is basically the same thing. They both have the same > external >>dimensions and everything should mount up the same. I don’t see anything > wrong >>with a 305. A 350 is basically a 305 with some slightly different > internals to >>bump up the compression ratio.
Response:
I have an 86 with a four speed manual. I love it. I didn”t like it at first but now I wouldn’t trade it for anything. The performance is definetly there with my 305. I also have a 350 that is rebuilt, mine was pulled from a 71 Chevelle/Monte Carlo. I was waiting until my 305 dies to do the swap. So far we’ve put over 40,000 on the truck and it’s stronger now then when I bought it. Of course we’ve gone through three clutches, an exhaust system, a carburator and a feul pump but that’s another story. Stephen – Hide quoted text — Show quoted text – >I have a 84 Blazer that has had the 305 removed and a 350 put it’s place . >wouldn’t have it any other way. >not knowing this at the time I bought it decided to rebuild it myself . Ran >the numbers on the block and found out it was a 74 Corvette >ngine( definetly time to do a little over kill ) >. The only thing I didn’t >like after the rebuild was the Trans. didn’t work too well ( 4 speed auto. ) >had to change to a Th 350 to get the performance I was looking for ( towing >and off road capabilities ) IF you have the 4 Speed Auto and you plan to be >a little rough with the truck you might want to think about a tranny swap as >well. could ask for a better runing off road setup.
Response:
Chevrolet offers a new(not rebuilt)350/210 horsepower 4 bolt main engine for around $1,250.00.I have seen them advertised in many Chevy magazines.If you can`t find one call Kilpatrick Chevrolet,Boaz,Alabama and ask for Maurice in parts.They had them last spring,and should still be available.Why pay good money for a crappy rebuilt when you can buy new?
– Hide quoted text — Show quoted text ->305/350 Chevy=3.48 stoke. >See my post above but, most >ECM’s do not have any problem. >David >> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have >> the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. >> Thankfully my current engine hasn’t blown up or anything so I am going to have >> plenty of time to shop around and find a good deal. Here is my question…what >> are some -important- things I should ask about or watch out for? I’ve never >> had anything this major done to my truck, and I’m not really a mechanic >> myself. I just want to make sure I can atleast ask the right questions when >> I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same external >dimensions and everything should mount up the same. I don’t see anything wrong >with a 305. A 350 is basically a 305 with some slightly different internals to >bump up the compression ratio.
Response:
305/350 Chevy=3.48 stoke. See my post above but, most ECM’s do not have any problem. David – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same external >dimensions and everything should mount up the same. I don’t see anything wrong >with a 305. A 350 is basically a 305 with some slightly different internals to >bump up the compression ratio.
Response:
> bore and stroke are the difference
Actually, just the bore. The Crankshafts in the 305 and 350 are nearly identical (they even have the same casting numbers…) although there is a slight difference to the geometry of the 305 crankshaft.
Response:
My question would be would the computer and fuel control be able to handle the different engine.
Response:
bore and stroke are the difference
– Hide quoted text — Show quoted text -> eh? Compression ratio??? then it wouldn’t be a 350 then would it? It would > be a 305 with higher compression the way you’ve stated it,correct? bigger > bore > FHLH > www.teamrocs.com > www.funkymonkey.net/fhlh > www.tx4×4.com >> The subject says it. I have a full sized 85 GMC Jimmy that I am going to > have >> the 305 yanked from and a brand-spankin’ factory-new 350 put in its > place. >> Thankfully my current engine hasn’t blown up or anything so I am going to > have >> plenty of time to shop around and find a good deal. Here is my > question…what >> are some -important- things I should ask about or watch out for? I’ve > never >> had anything this major done to my truck, and I’m not really a mechanic >> myself. I just want to make sure I can atleast ask the right questions > when >> I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same > external >dimensions and everything should mount up the same. I don’t see anything > wrong >with a 305. A 350 is basically a 305 with some slightly different > internals to >bump up the compression ratio.
Response:
eh? Compression ratio??? then it wouldn’t be a 350 then would it? It would be a 305 with higher compression the way you’ve stated it,correct? bigger bore FHLH www.teamrocs.com www.funkymonkey.net/fhlh www.tx4×4.com – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same external >dimensions and everything should mount up the same. I don’t see anything wrong >with a 305. A 350 is basically a 305 with some slightly different internals to >bump up the compression ratio.
Response:
If you really want to get some go, but you will have to spend some extra money, you can get the 330 HP 350 crate engine, part # 1286041. If you were ever planning on a HP increase now would be the time.<g> If you are in Canada, the old targetmaster engines have a 36 mo/80,000 km warranty, including parts and labour if installed at a GM shop. Something that you could do is to have a few mechanics do a written quote for you on the job to be done, especially if the truck is still driveable. – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. > BTW, can anyone in the Portland/Vancouver area suggest a good shop I ought to > check out? > Anyway, ANY and all help/info would be -greatly- appreciated. Obviously > because of the expense involved this is NOT the kind of thing someone wants to > screw up. =O Thanks in advance! > Jason > — > Surf the www alot? Want to get paid for it? Sign up is free! > Join today! > http://www.gotoworld.com/getpaid/default.asp?rid=1017072207
Response:
Actually…a 350 has more cubic inches than a 305 and 9 times out of 10 it is CHEAPER to go with a 350..as they are the one of the most common engines in the country. More cubic inches means more HP and Torque ( your engine does not have to work as hard to pull your truck around ) A NEW…GM warranted ( 12mo 12k miles ) 350 complete engine can be had for around $1200 or so… Do a search on the net for Jim Pace parts…they are VERY reasonable. On the warranty, GM will pay the labor to remove / install the engine if it craps out during the warranty. WELL WORTH the money IMHO. HTH
– Hide quoted text — Show quoted text ->We have done plenty of them including the stroker >motors and roller motors. A search for a prom >update or speed dens is common protocol. >David >> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have >> the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. >> Thankfully my current engine hasn’t blown up or anything so I am going to have >> plenty of time to shop around and find a good deal. Here is my question…what >> are some -important- things I should ask about or watch out for? I’ve never >> had anything this major done to my truck, and I’m not really a mechanic >> myself. I just want to make sure I can atleast ask the right questions when >> I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same external >dimensions and everything should mount up the same. I don’t see anything wrong >with a 305. A 350 is basically a 305 with some slightly different internals to >bump up the compression ratio.
Response:
We have done plenty of them including the stroker motors and roller motors. A search for a prom update or speed dens is common protocol. David – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. >A 305 and 350 is basically the same thing. They both have the same external >dimensions and everything should mount up the same. I don’t see anything wrong >with a 305. A 350 is basically a 305 with some slightly different internals to >bump up the compression ratio.
Response:
The only difference is the 350 has a 4" bore (piston diameter), whereas the 305 has a 3.75". I asked a local speed shop about this (a friend of mine has a TBI 305 in his ‘87 Chevy and was thinking about doing the same thing.) The speed shop guy said mechanically, it wasn’t a problem. What he said would be different would be fuel consumption. The stock 305 TBI wouldn’t be able to supply enough fuel at high RPM’s (3000 RPM +). Not a problem though, as you can easily swap it out. If your 305 has a carb on it, then it’s just a matter of rejetting to handle the additional air consumption. – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. > A 305 and 350 is basically the same thing. They both have the same external > dimensions and everything should mount up the same. I don’t see anything wrong > with a 305. A 350 is basically a 305 with some slightly different internals to > bump up the compression ratio.
– Lyle Pakula
Response:
Get a warranty in writing in English or whatever your favorite language is. I replaced one 305 with another and when the transmission went one month later I had that replaced. Ahhh my problems are over only problem is 1,000 miles later the motor blew a head gasket and the mechanic was pointing the finger at the transmission shop.Once the second new 305 was in {after fighting with oh we just need to put a head gasket and change the oil} the transmission started slipping in third. The transmission guy wanted to go buy the 90 day deal I told him between the two shops I drove the thing about one week. Then he started pointing to the guy who put the motor in.Now I am hooked up and the thing seems to be ok. Once again get it in writing not saying the people I delt with were trying to screw me but when the shit hit the fan everyone was doing a lot of talking and not a whole lot of wrench spinning once the check cleared. GOOD LUCK BTW the 305 is not very powerful in my jimmy I wish I put in a 350 – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. > BTW, can anyone in the Portland/Vancouver area suggest a good shop I ought to > check out? > Anyway, ANY and all help/info would be -greatly- appreciated. Obviously > because of the expense involved this is NOT the kind of thing someone wants to > screw up. =O Thanks in advance! > Jason > — > Surf the www alot? Want to get paid for it? Sign up is free! > Join today! > http://www.gotoworld.com/getpaid/default.asp?rid=1017072207
Response:
FWIW, I would make certain that the computer can handle the increased displacement. I have heard of some who have swapped bumped their 350’s to 383 and the computer could not handle that little bit of displacement increase. At idle the truck would idle very poorly. I assume a real lean condition. You may not have the same problem if yours is not TBI (maybe you have an electronic Q-Jet?), but you may want to check. The condition that I am describing happened on the 90’s series TBI trucks. Just a thought, Tom Trezek – Hide quoted text — Show quoted text -> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc. > BTW, can anyone in the Portland/Vancouver area suggest a good shop I ought to > check out? > Anyway, ANY and all help/info would be -greatly- appreciated. Obviously > because of the expense involved this is NOT the kind of thing someone wants to > screw up. =O Thanks in advance! > Jason > — > Surf the www alot? Want to get paid for it? Sign up is free! > Join today! > http://www.gotoworld.com/getpaid/default.asp?rid=1017072207
Response:
The subject says it. I have a full sized 85 GMC Jimmy that I am going to have the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. Thankfully my current engine hasn’t blown up or anything so I am going to have plenty of time to shop around and find a good deal. Here is my question…what are some -important- things I should ask about or watch out for? I’ve never had anything this major done to my truck, and I’m not really a mechanic myself. I just want to make sure I can atleast ask the right questions when I’m shopping for a decent price etc. BTW, can anyone in the Portland/Vancouver area suggest a good shop I ought to check out? Anyway, ANY and all help/info would be -greatly- appreciated. Obviously because of the expense involved this is NOT the kind of thing someone wants to screw up. =O Thanks in advance! Jason — Surf the www alot? Want to get paid for it? Sign up is free! Join today! http://www.gotoworld.com/getpaid/default.asp?rid=1017072207
Response:
> The subject says it. I have a full sized 85 GMC Jimmy that I am going to have > the 305 yanked from and a brand-spankin’ factory-new 350 put in its place. > Thankfully my current engine hasn’t blown up or anything so I am going to have > plenty of time to shop around and find a good deal. Here is my question…what > are some -important- things I should ask about or watch out for? I’ve never > had anything this major done to my truck, and I’m not really a mechanic > myself. I just want to make sure I can atleast ask the right questions when > I’m shopping for a decent price etc.
A 305 and 350 is basically the same thing. They both have the same external dimensions and everything should mount up the same. I don’t see anything wrong with a 305. A 350 is basically a 305 with some slightly different internals to bump up the compression ratio.
