Small Block & Big Block Chevy Specific - milling heads???

when you mill the heads is that going to make them flow beetter..i know that it changes your compression a little bit...

Never heard that. We do it to make chamber smaller, or repair boo boo's.

AFR told me that it cuts down the numbers. I've had to do this twice to my AFR 190's now. Stock they were 74cc. Keith Black Hypercrap piston came apart at the upper ringland and sent millions of aluminum parts in the CC's. AFR took them down to 73cc's. They are currently being taken down to around 70cc for my next Marine motor build. AFR said I would lose a little flow over the stock 74cc configuration.

thanx...