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at this moment, It's a toss up between the Speedpro 2355 forged pistons, which have a 2.061 compression height, and the Keith Black Silvolite 237 Hypereutetics, which have a 2.067 compression height. Both are close to the factory specs, although the 237's have only 2 valve reliefs, which isn't a...

Yes, 4 valve relief Six Pack pistons, and 346 heads in 1971

I just compared the Speed Pro pistons, and the 2355 looks closest in compression height and it has 4 valve reliefs like the factory pistons have. But if it is .017" down in the bore like Gunner1 says above, then its lower compression than stock. The 2266 looks very low compression

my factory installed 440 Six Pack pistons are zero deck. Edit: Close to zero deck. I have it all apart, and did not measure before pulling it apart, but they were visually very close to zero deck.

I'm rebuilding a 71 440 Six Pack. Completely stock. I would like to use pistons that match the original specs for compression. I see the Keith Black KB 237 pistons appear to have the same compression height. Anyone have experience with these pistons? Other than the modern head gaskets being...