Ole Buck
Senior Member
from what I have read cams alone are from 20 to 35 hp gains. Remember i read that. Mine feel a lot peppier than the stock. But i added a HO intake, headers high flow cats and a flow master super 44. And man do that have a nice "thump" to them coming out of that flowmasterYeah I’m getting remanufactured head built right now so everything in them will be brand new. What are the gains in the newer 4.7 compared to the pre 08+?