This is a NASCAR Busch Chevy V6 275CID 90 degree odd fire engine, Pontiac 18 degree aluminum heads #10134359, match ported and flowed, 2.125 int, 1.65 exh, ti valves, with new dual valve springs, 7/16 studs, roller rockers 1.65 ratio int, 1.6 ratio exh, rev limiting valve train, aluminum Brodix intake, Chevy bowtie 4 bolt main block, chevy counterweighted odd fire crank, h-beam rods. Chevy odd fire distributor. All major engine components from Chevy racing bins. Dry sump oil system, pump, tank, cooler, filter. Engine is reported to be 12:1 to 13:1 compression, and make 450+ HP. Rev limit 8,800 RPM. I have removed pan and inspected bottom end. No discoloration of moving parts, very clean, no metalic particles. NASCAR style pass side chassis header exhaust included. Needs carb and flywheel.