Valve Spring Pressure - BBC stocker

[Chipper Chapman]

Originally Posted by nhramnl

I completely agree with Alan, but have a question. Is the camshaft you're using one you've used in the past without problems, or is it something new, perhaps with lobe profiles that are somewhat "exotic"? If the intake lobe ramp profile is too extreme, even with the kind of valve spring pressures and piston-to-valve clearance you're talking about, the lifter may not be able to stay in contact with the lobe, and you end up with an uncontrolled valvetrain. Just a thought.

This is what my fear is, When I called to have cam ground I had called Chris P when he was at crane, he left while my cam was to be done and it got shuffled over to comp and ground totally different than we talked, in a more aggressive fashion. I usually check the ptv the simple way with clay, but also checked it by opening valve with checking springs and degree wheel, same result both ways.

For reference camshaft is COMP .396/.396 lift, 288/294 .006, 248/254 .050 and on the big core