Attribute Name: 550 is an ideal horsepower cam for 114 and larger engines. Kits include all required bearings, O-rings, and hardware. Made in the USA. Intake Front/Rear Open: 9.4 degrees/3.1 degrees. Intake Front/Rear Close: 29.4 degrees/31.1 degrees. Intake Front/Rear Duration @.053: 218.9 degrees/214.2 degrees. Intake Front/Rear Valve Lift: .550in.. Exhaust Front/Rear Open: 62.5 degrees/59.4 degrees. Exhaust Front/Rear Close: 30.5 degrees/38.4 degrees. Exhaust Front/Rear Duration: 273.1 degrees/277.8 degrees. Exhaust Front/Rear Valve Lift . Values (Page 1)