After a long time debating what heads I was going to use, I got a set of decent used gt40 (f3ze) heads for $75 complete. Ill do a little port cleanup on 'em, mill 'em, valve job, and have a decent set of heads for notta lotta dough. Ill be using a stock HO roller cam with 1.7 rockers and will be keeping it under 6,000 rpm, so its not like I need some race setup. Ive heard people claim that the stock springs are good for something like ~.515 lift. I plan on a set of retainers to eliminate the multi piece stockers. My question is regarding the springs. What size does it use, what size can I get away with and not have to do any extra machining, and can I just use the old springs?
Also, how much is it safe to mill these heads? The general rule Ive heard is that after about .030 you may need to face the intake side so the intake will actually bolt up with out a fight.
Also, how much is it safe to mill these heads? The general rule Ive heard is that after about .030 you may need to face the intake side so the intake will actually bolt up with out a fight.