APPLICATION: Grind# 284R - Roller Lifter Ultra Action / Performance Level 5 - High Torque Oval Track Cam. RPM Power Range: 2500-6500 - Redline 7500 RPM+. Crower Racing Cams deliver the horsepower and torque you need to win!Pit Stop USA offers Crower Ultra Action Roller Racing Camshaft - SB Chevy - Duration @ .050: 256 Int./ 260 Exh., Lobe Separation: 105°s, Gross Lift: 626 Int./ 627 Exh. Crower 00430 at low everyday prices. Be sure to check out all of our products from Crower including Crower Roller Cams - Small Block Chevy.