Basically a shelf piston but I added some options such as lateral gas ports, max lightening, coated skirts, etc. It isn't a super trick setup, Molnar crank and rods and semi-custom pistons. Pistons have a very small dish in them to make the compression 10.8 to one. Heads are Trick Flow 270 right out of the box. No porting or machine work on the heads. They were inspected and cleaned and bolted on.