622
give you some truth to your set up the comp is to low for such a deep stroke. You will still make around 800hp but you will not be getting the best out of this set up. Better you go with a 555 and make 900 and the motor will run clean. Deep strokes need a lot of comp trust me I was were you was at and I had to see Mr.Sonny $8,500 later now the engine is right do it right once not twice.