24-08-2024, 12:24 PM
It’s not the lift,as such, it’s the acceleration as the valve opens. Theoretically at least the acceleration at opening with flat tappets is infinite. It probably isn’t quite but you get the idea. Nippy cams, likewise, have very sharp ramp angles. I agree with Dave. My trials car, when I did such things in the 70s/80s was on a standard cam with 3/4 radius tappet blocks. It was quite successful. My advice would be to sort out the inlet/exhaust manifolds before you even think of the camshaft, but when you do, talk to Paul Bonewell and listen to his advice.
Alan Fairless