305 in GMC Sierra
Question:
>83 GMC sierra with a 305 that has suddenly taken to missing, and backfiring on > acceleration. Checked timing. Doesn’t always do sputter, but when it does, my > heart pauses.
Check the timing chain. Easy to check without pulling much apart. Take off the distributor cap. Rotate the engine backwards by hand (duh) at least 1/2 – 1/4 turn, but enough to put the timing marker somewhere on the scale. Put a clothes peg or something at the tip of the rotor, clamped to the body of the distributor. Now, again by hand slowly rotate the engine forwards until the tip just starts to move. How many degrees of rotation? More than about 8? Chain’s probably stretched. > As in it’s darn cold right now to be spending fruitless hours looking for > erratic motor jerks. Then again, stranded wife isn’t much fun either.
Depends on your overall state of relationship… 
>Question. Will a used or rebuild 350 connect to 305’s auto transmission and > otherwise work ? If i’m getting into major grease, 350 would be a much better > choice, no ?
Oodles more power. Bellhousings are the same. If your trannies weak you might kiss it goodbye the first time you tromp it, but it’ll still work.
Response:
83 GMC sierra with a 305 that has suddenly taken to missing, and backfiring on acceleration. Checked timing. Doesn’t always do sputter, but when it does, my heart pauses. Put new wires and dist cap on about a month ago, before this problem. I’m thinking only bad thoughts. Wasted cam, burnt valves, fun stuff like that. As in it’s darn cold right now to be spending fruitless hours looking for erratic motor jerks. Then again, stranded wife isn’t much fun either. Short of taking motor apart, i’m stumped. Question. Will a used or rebuild 350 connect to 305’s auto transmission and otherwise work ? If i’m getting into major grease, 350 would be a much better choice, no ? Or any other thoughts. jim
