40 over 427 with a chevy steel crank, Eagle H beam connecting rods and Keith Black forged blower pistons. It has a Comp cams blower cam and comp cam stainless rockers on 990 open chamber heads with Manley stainless valves. It has a Big Al's supercharger with Holley 600's. I will throw in the Manual valve body turbo 400 and the 3500 converter too. The motor has very little time on it. On and off the trailer and a little bit around a few shows. Maybe 100 miles. You know it cost twice this to build it. You can see a video of the motor running and if you want to see it run you can. I posted it on you tube and the link is https://youtu.be/PxgV01Gpces. If that doesn't work just search Chris Riley supercharged Big Block Chevy. There is also a video of the boost and oil pressure when cold. The oil pressure is 80lbs. The perfect mill for your prostreet project.