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Old 09-25-2018, 08:09 PM   #7
5Tractorguy
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Join Date: May 2015
Location: Central Massachusetts
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Re: 1988 TBI to 1991 TBI Conversion Q's

Quote:
Originally Posted by mikebte View Post
This will sound crazy. What year is the block. I know you say 88 engine. GM had an issue with moving timing marks around on engines. Sometimes when doing a TBI swap the timing cover from the TBI engine gets put on a block that has timing set different. It may not be the issue. But always worth a look, takes 2 minutes. Picture does not cover every timing cover, but you get the idea.
That I will have to check! Timing has always been in the back of my mind on this...

Original engine had a crack so another 350 block got rebuilt. It was buy a very reputable engine guy from the area, but maybe the cover was swapped... mistakes happen. If I remember I'll check the truck Thursday when I'm out, have it parked across town.
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