P/V clearance and cam timing adv. relations
P/V clearance and cam timing adv. relations I have an XER 238/242 113lsa 113icl cam. My heads are 243's milled .030 and I'm running a .040 cometic gasket. I have my pistons flycut on the intake at .095", but the exhausts aren't flycut. I have plenty of P/V clearance on the intake right now, but the exhaust is VERY close. I'd like to gain some P/V clearance on the intake, up my DCR, and bring the peak power RPM down some. I'm thinking that by using my adjustable timing set and advancing the cam 4* for an icl of 109, I could accomplish all of this. This cam is pretty much the same as a MS3. How much exhaust P/V should I gain by advancing 4*?
