Blimey,

What a thread

The answer is yes you could have 500bhp. I am at 480 bhp with standard sized ports on in the head. Ok my c/r is lower than standard at 7.6:1 but my engine is proof that it can be done (well almost anyway) IF i get one of Spec R's intercoolers i think 500 bhp may be cracked. Cam choice is obviously a big winner