HomeAll RepliesRe: What horsepower is this motor Re: What horsepower is this motor Sponsored December 29, 2011 at 2:13 pm #38734 aza993aParticipant 500-600? Not with that cam. With a good sized cam, I could see 450 at the wheels possible, which would be around 500 at the fly. As it sits, maybe 400-450. Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored