Originally Posted by sleek silverado

You are comparing apples to oranges. F-body's have a 6 speed manual in most cases and a 7.5" 10 bolt. Most trucks have a 4L60e and a 8.5" 10 bolt. There is quite a bit of difference there. About 6-8% more drivetrain loss from an F-body to a truck.

Second, you can put a h/c combo on one car and then on another car, and can get significant power differences. So, in fact you might have that freak 4.8 that makes 350, or you might have a turd that makes less than 300. Who knows?

Thirdly, a lot of guys on here have tried countless cams, heads, etc, trying to make good power. To say that the people on here are not trying that right h/c combo is ignorant.

Fourth, big cams don't neccessarily mean big power. Go to big with your cam selection, and you will regret it. Stuffing a 230 duration cam in a 5.3 is dumb, especially if you have an auto. I think you said you had a 5 speed.

Really, this post is to try to help you not waste money. After all you did come here for advise and this is mine. I really hope I helped you out. Happy modding!