Originally Posted by TruBlu351
I'm running flat tops and I'm 99.9% sure I only have exhaust valve reliefs in the piston tops.
"Roughly" speaking if I ran upto a 600 thou intake valve lift (~240* dur'n) will this potentially come close to the 100 thou piston clearnace limit? Block's been decked (I'll have to check how much when heads come off.....I think it's slightly below zero), and heads will be new unskimmed.
I'm aware of the variables and the only way to know 100% is to check the final assembly with a dial gauge. Just gathering rough info from peoples' experience.
I have never seen exhaust valve reliefs in aclevo piston .Whether you have one relief or two they are put in for the intake valve. 600 lift should not cause any dramas with the stock valve reliefs.What pistons are you running?
I ran a solid of .623 lift and 260 @ 50 with no problems and standard reliefs in a l2379 trw forgie.
I would be more concerned with the exhaust valve clearance on any engine that i built . The intake valve is usually quite safe but rather the exhaust valve is the one that cops a hiding. As the exhaust valve is closing the piston is chasing it up the bore . If the engine experiences uncontrolled valve toss during an over rev situation then there is the possibility of Ex valve contact .