Guys, I'm sorry I don't actually know the info.. I got the motor built by Don Cruz. Getting info from him is like trying to sell Ice to an Eskimo. I just told him I wanted something that would make some serious power and be a TRUE contender if not the BEST in TSM. I spent an absorbant amount with him over 16k. For a couple grand more I could have built a TA block. All I know is he delivered. This motor got tuned by Cal. Made some VERY serious power at a very moderate 24.6psi. This thing picked up almost 49hp per pound pushed on it, and it didn't miss a blip. The true secret to the success is giving Cal all the components he needed to get the data he needed to push the motor without hurting it. If I would have pushed 30psi, I wouldn't doubt it would have given me in the mid to high 900hp to the wheels... I didn't because i wasn't prepared to push it that hard. Being forthwright, I was scared I would break the block. I am currently working on putting a motor plate on this car so I can push it to 30-35psi. It doesn't guaranteee it won't break, I just will feel a little better doing it. I hope you guys can appreciate what I'm telling you. I will tell you I didn't take any shortcuts on anything.[/QUOT