Good Cam Choice?

Usually on a more serious effort you’ll see that huge lsa carry a bit more (longer) up top than it did in that test. I think that was more a function of a relatively mild combo running out of cylinder head as they all roll over about the same spot. Maybe some valvetrain instability happening there as well.


That’s what I used to think but Godbold says in his book that they use the wide LSA for piston top geometry. He says even a Pro Stocker (pre EFI and rev limit) can use a tighter LSA but the valve pockets get too deep and the BSFC goes up. So they widen the LSA to get the valve notches less deep