with my 408 at around 8.9cr i can only run about 11psi and thats with prety low timing before i see knock. i dont think you will see 15 without meth or race gas.


prety sure you could make more power on the same fuel with the 6.0 heads. you have plenty of turbo there. i think i would try the 6.0 heads.

 

Thanks for the advice... Yeah Im think Im going to run the 6.0 heads because I know they flow alot better on the exhaust side plus they will put me at about 8.3-1 CR.

 

FWIW: My CR is 8.5:1 and I can run 12.5# on 87 octain with no knock

 

Ok you talked me into it

 

Good boy

 

Yeah, it's the same story on my exhaust. Still haven't decided how I wanna route it out the back so it's just dumped under the bed right now, but sounds awful so hopefully I'll have it finished in 2 weeks or so. But my radio has gone out so that's the first order of buisness for me.

 

I know.... I just try to do one thing at a time well that about all I can afford.