E-Heads 564 equivalent cfm at 15 psi boost. That
is right about where the good Pro Stock Chevy
heads are right now. (282 at 25 inches with a tootsie roll touch-up. 255 exhaust at 25 inches
with a lot of work.) Marty Palbykin made 1400 hp
with a 240 head at 25 inches. With boost the head
flow is not as important as the sealing and I wanted my intakes/ heads to be as strong as possible. Tom V.