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I have a 1991 S-10 Blazer. 4.3 z code. I was wondering if my shortblock would be the same as like a 99 model blazer. I found a good deal on a 99 blazer but it has a rod knocking. My motor runs great but the body and other things are starting to go down hill. Would it be an easy swap to put my 91 4.3 shortblock into a 99 blazer ? Or would a bunch of things be different ?

I don't mind doing a lil work. But I don't wanna run all over the country looking for little parts to make it work.
 

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I'm in the middle of swapping a 94 4.3 into my 97...the only usable thing from 1 block to the other is the bottom end and push rods...heads are different and all the brackets on the front (alternator, a/c) are on opposite sides. 94 bellhousing is 2 pieces with 6 bolts, 97 is 1 piece with 9 bolts....according to GM you can't put a Z code engine into a W without work....thats where i'm at hopefully you have less trouble than I
 
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