Quote:
Originally Posted by 400 Lemans
I don't see any water passage mods in your block pics. Looks like any other Pontiac, stock block setup.
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I just got through looking at STEVE BARCAK mod and 1A2 Block cooling holes and 421 style cooling holes, I see that the 421 mod holes are not in the Head nor the Block. There are additional 3 holes that I would have to plug in the Block per side, I see that the factory did close 4 holes per side on the Block on mine. Plus, I need to drill the holes in the Block and heads between the two exhaust valves.