454,502, 540, 572 cu. in. Gen 6 engine Hydraulic roller camshaft designed for EFI application, good mid-range torque and top end power horsepower Good idle quality around docks, mild choppy idle for aggressive sound Basic RPM 2500-5,300 Hydraulic roller lifters (optional) ASM502$325.00 If you don't see what you're looking for please call or e-mail us. Phone: (480) 753-0208 Fax: (480) 753-0216 Hours: 8am - 5pm M-F Mountain Standard Time Click Here to E-Mail AZ Speed