When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Actually, the HP rating depends on a LOT of things:
1)compression ratio- regular or premium gas required
2)intake- 2v or 4V intake? or something else?
3)cam grind-torque biased truck engine vs other
4)single exhaust or duals
5)cylinder heads -- valve size
6)SAE or net? They changed the rules...
How much horsepower is kind of like asking how big is much?
No offense intended, but you need to refine your question...too many variables.
tom