Something I forgot to mention in my other post: the reason I suggested another cam is this. The car we put the Buick system on was a 72 Dart from California. It was rated at 105 HP. The top end on the car was 105 MPH. With the turbo on and running 7 PSI boost, the car would accelerate like crazy, but the top end was still 105 MPH. After a better cam was installed, the car ran faster to the point we didn't want to find out at what point the rods would snap. So I don't know how many RPMs it would run. There are now available chromoly H-beam rods available for the 225, but I forget who has them. Check with Diamond pistons and they should know. Bill