Thanks for all your help. I just have a couple more questions for you'll. I talked with John over at SandToyz & he told me that he had the Cubs & pistons4the short rod crank. Would I have to have my cylinders ported or can my mechanic just slap them on & it'll be ready to ride? When I was goin to get this setup b4 someone told me when I buy them I had to port them b4 I could put them on. My mechanic mentioned a dune port to me. I mainly ride my bike on the street & do some street racing (not planning on goin to the track) but I do wanna go faster.