Attribute Name: Add more torque to big-bore engines, especially below 6000 rpm. Cam requires the use of adjustable pushrods and heavy-duty valve springs (sold separately). Kits include all required bearings, O-rings, and hardware. Made in the U.S.A.. Intake Front/Rear Open: 17.7 degrees/14.9 degrees. Intake Front/Rear Close: 30.6 degrees/28.7 degrees. Intake Front/Rear Duration @.053: 228.3 degrees/223.6 degrees. Intake Front/Rear Valve Lift: .540in.. Exhaust Front/Rear Open: 21.2 degrees/37.7 degrees. Exhaust Front/Rear Close: 33.9 degrees/26.9 degrees. Exhaust Front/Rear Duration: 235.1 degress/244.6 degrees. Exhaust Front/Rear Valve Lift . Values (Page 1)