Or you could listen to the guys who build these engines every day, who are trying giving you advice....Steve.k wrote: ↑Tue Jun 19, 2018 9:51 am Mark says for anything over 800 use the pro port or kaase 400 (im thinking i should really listen to the guy who builds the product).He did say some Aussie builders have a program for the 225 head to get close. If its not the hi port you will struggle to hit 700. Im thinking your heads Brent started as these then you upped the valve size for more curtain area. The 240+ cc is a lot bigger than mine and the curtain area is bigger. That would obviously make for more hp on same cube motor.
We start with 225cc heads. Doesn't take much. My heads with the CNC port are not the same as the Pro Port or Kaase head.
Do some research on wave harmonics. Runner length is a major component of that, as well as CSA. It's all based off the rpms you want to turn, the size of the engine, etc. There would be different lengths depending on the track, whether it's a short track, long track, if you need lower rpm response (road course), etc.