Right now I have about .065 (1.65mm) I am being told that I need .080-.100" clearance. The camshaft is a new billet with about .452" lift and 272 duration. 7K rev limit
I had another guy tell me:
Which is only about .025"I run around 0.6-0.7mm clearance on my race engines that go to 9k.
The pistons are stock cast pieces with a single notch for the intake valve. Clearance is checked using a used stock headgasket at factory torque specs. I am using playdo and then check the depth.
Will .065 be enough or should I go deeper?
I ask you guys because I know the engine building experience here is above and beyond what I might get from a BMW board filled with mostly teenagers whose idea of rebuilding an engine is changing rings and bearings and calling it a day.
Thanks,