Valve to piston clearance?

You gotta be a bit more careful with fast ramp camps like a VooDoo... it gets the valve open a lot faster. At the .050" lobe lift points, a 262 fast ramp cam will be more like a 272 or 275 for a medium rate cam, and like an even higher duration for a really slooow ramp cam.

(But eyebrows are easy to cut into cast pistons....!)