yes i know the origs can make 1000 and the porting cost the same my situation is i can buy a set of origs locally or buy new MCs at $3000+ diff in price.so 3k worth the gain in hp?
M/C's are easily 1000HP with a 4.500 bore and can get to the 1100 range too. As said, get the M/C's and have room to grow with a cam change. If the price of Koffel's and Hemphill are the same, I would have Hemphill do the porting. He's been doing it almost as long as Koffel and I've heard some impressive numbers out of his stuff. Nothing against Koffel, just what I know about Hemphill. I wouldn't have someone experiment on them, that's for sure. JMO