Ok I'm running a pretty large duration cam with stock E7s and I also have 1.7 rockers which was my stupidest mod choice (shoulda added 1.6) The duration is 236. So if I'm not beinding valves than I shouldn't with any aftermarket heads right?
Also how do you do the clay test to check PV clearance. I'm thinking if aftermarket heads have stiffer valve springs than stock and I'll be using a slightly thicker head gasket (how much compression will I lose per mm if anyone knows an estimate)
By the way, I'm going with a 1.90 by 1.60 aluminum head. Can't decide between AFR 165 and EB Perfs. Money is an issue because I am making 7.79 oer hour
Thanks
Anthony
Also how do you do the clay test to check PV clearance. I'm thinking if aftermarket heads have stiffer valve springs than stock and I'll be using a slightly thicker head gasket (how much compression will I lose per mm if anyone knows an estimate)
By the way, I'm going with a 1.90 by 1.60 aluminum head. Can't decide between AFR 165 and EB Perfs. Money is an issue because I am making 7.79 oer hour
Thanks
Anthony