CALL911

My car;

1995 Z28

383 LT1(Lunati Sledgehammer Crank, Oliver Billett rods, custom Diamond pistons)
8.8:1 CR
Custom Camshaft 244/254 @ .050, .578/.578 lift, 114* LSA
Super Vic EFI intake
Kooks long tube headers
Custom Y-Pipe
Borla Cat-Back
ASM 58mm mono blade TB
60# Injectors
M6 w/Moser 12 bolt and 3.73's
FMIC
Meth injection
D1SC with 15#'s of boost
24x conversion


My question is, that given that setup, what would be the difference power wise between AFR 227 race ready heads, and AFR 227 competition heads? Given the lift of my cam (.578) the CFM difference between the two is 15 CFM according to AFR's website (at .550 lift).

I am trying to decide between the two and want to know if you guys think I'll see greater than a 15 RWHP difference between the two or not.

Kevin Blown 95 TA

That's a tough question to answer. They advertise that both models of heads are 100% cnc ported. I'd say, get the race ready heads and do any smoothing out of the porting yourself with some cartridge rolls and bag the extra $600 or whatever the difference is. For one thing, their flow rates are based off a 4.125 hole and 65cc chamber size before the head is ever milled, so you aren't going to get those exact numbers anyway - Of course if you are going with 65cc chambers, that would obviously help. On the other hand, your blower will shove a lot of air through there with or without their extra complete porting.