The pistons were custom-made by JE pistons, c.r. is 10 to 1, cam reground by ISKY (i think 270 deg., don't remember lift), balanced, ported, sanderson headers, align-bored, and overall displacement due to .030 over is about 244. Interesting story about the pistons is that since nobody made custom forged-aluminum pistons for this engine, the engine builder had to make clay impressions of the cylinder head so JE could proceed.