noss haeads are good heads !!! i run a k&t head which runs cool head domes. for reg gas-- 20 dome, u also need to check your compression. sea level makes a diff. go to F.A.S.T. web site, thats where i order all my stuff. owners name is jeff... he's good at what he does and has the best customer service around (if you dont belive me go to bansheehq and do a search on F.A.S.T..)

 

Stage IV is the Trinity coolhead and you need to buy your domes from them. The Noss Head is definatly the way to go and the domes are interchangable with Pro design coolhead domes. 20cc domes and +4 timing advance at sea level will probably put you in the 155-160psi range and that calls for at least a 50/50 blend of 93 and 110 octane.

 

vp c-12 race gas is 108 octane. thats what i run.