Indy/rhs heads?

74burnt

Under the curve is sometimes and most of the time more important than top kick numbers.

Think about these numbers for a fictional set of heads. .100-.500
first set
71
100
120
150
350

Second set
71
130
200
265
320

Which one would you rather have. I know which I'd want.

Even putting a .500 lift cam in a engine isn't going to access the lift at .500. Think about how long the valve is actually at max lift. Not much. You might get lucky and functionally access lift rates of 430-450. Plus, don't even get started on crappy 59* rocker gear and resulting valve lift loss from the compound angles. That will compromise your actual lift at the valve as well. Might at that point, be lucky getting the .400 lift range in the cylinder.