Quote:
Originally Posted by Efi69Cam
Gen 6 heads fit the 4 block. gen 5 was the odd-ball.
I'd snap up the offer for the GMPP ovals with intake. That's a smoking deal.
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Gen 5 and 6 heads are the same, the diff between a gen 5 is a non roller engine in 96 the engine was changed to a roller engine with raised lifter bores and noted by a composite 6 bolt cover the heads are the same casting number the crank rods pistons are as well, both 5 and 6 are priority main oiling gen 5 and 6 use the same head gasket 4 does not If it is any need I can snap some pics of 5 and 6 heads I have about 45 take off sets, do your research its your money. That is based on production gm iron heads, If you take the gm performance aluminum heads the new ones they will work on all blocks except gen 7 8.1 series, those heads as all ne aftermarket alum bbc heads have small water passages but added material to seal the block on 5 and 6 motors if using them use the correct head gasket.