Originally Posted by Cab_Burge
I'm building a B1 E85 motor (572 C.I.)

Cab,
As I recall, that motor you are building is not a high compression setup, right? What CR is it?
What are the spces on the Koffel's cam you have?
IMO, the "lower" CR will limit the amount of duration I would use. So what a 14-15 CR motor is running may not be a good choice for you.

I didn't pick my cam, it came as a package deal when I bought my B1 original heads from another racer. FWIW:
14.3 CR
572 CID
282/295 at 0.050"
0.480"/0.470" lobe lift, 1.7 ratio rocker arms
113 LSA




1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1