Compression...

I had a 440 that was built using low compression TRW pistons that were rated for 8.5:1. They sat around .090" in the hole. The heads were milled a bunch and I used a thing gasket to get compression up. I would say it was under 10:1 still when I was done. The cam was a good size, 245 @ .050". It didnt like pump gas. I had to mix to keep it from detonation.