Since I just purchased a set of these heads and intake to top our New R3 block, I was wondering just how much Naturally Aspirated power that people are really making with these? I know what they are capable of, but how much power or what is the most N/A power you guys have seen? Ours will be 4.155 bore with 3.79 stroke with 12.5-13:1 compression and an unknown cam so far. Solid roller however. Just curious.


10.53 @ 125mph. 1.37 60 foot. Caltracs and Monoleafs, AFCO shocks.

Heads by INDIO MOTOR MACHINE; IMM.
CP Pistons, PC Carbs.