Chevy 4.3 V6

T-Test

solid fixture here in the forum
Anyone know the difference in early and late model heads exhaust ports for headers and if the bolt patterns are different from round /oval/square ports. I can't find anything except the difference in model years. !984 to 1995 same and 1996 and up is different Do all these have air injection?..
 
I have a 1997 Blazer yet with a bad Vortech 4.3.
Made 1996 -2001 in S10 Blazer.
Kept around in Silverado to 2011-2014 what I have seen In shops turning wrenches.
Keep my Blazer yet because it's a 4x4 model.

Earlier 4.3 V6 has may differences from later Vortech.
Not much the same I know.
 
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