Im about to order Absolute Stage II heads and im wondering what kind of numbers i should see after installing them on my 98 z28 M6. Im going to dyno tune the car with ls1 edit as well after the installation. Just a rough estimate would appreciated. Here is the list of my mods.
B1 cam
Hooker headers/ory
Texas-speed Lid
Borla exhaust
Ported maf ends
smooth bellow
Asp crank pulley
SSRA
Ported TB
4.10 gears

 

I think wiht a M6 car you could see 420 + rwhp if the car is tuned correctly. There was someone who posted like 437 wiht a 224 cam Which I think is only alittle larger than yours. I have a a4 car with the absolute speed stage 2 heads and a tr230 /224 cam and I got 420. BTW great choice on the head selection

Jeremy