Hi,
In future, i will put a 2.8" pulley on my astra Z22SE supercharged car with dualpass, ported head, LS4 T/B, ported T/B, ported SC, vxr injectors, 3" exhaust system and maybe some oversized valves. Ecu remap with Odbtuner.
I bought 10 CR Wiseco pistons/con rods to support the hp.
I read 8.9...