there casting number 461 camel backs the bowls have been blended and a mild port/ polish, also the heads and intake are gasket and port matched, the cam is .560 lift and 248 degrees duration i rev the motor to 6800, and ive got a 3500 stall and 3.73's , and the pistons i have with the stock 64cc heads should be 9.6:1 but my heads have been milled .020 and im running a .020 compressed head gasket so its more or less an est. but it should be between 9.8 and 10 an ive got a holley 750 hp, super comp headers, and 3 in exhaust th-350 trans and a 8.5 in rearend and a nitrous works kit with a 100 shot at the wheels let me know what u think