The 454 H.O.'s factory-equipped hydraulic-roller camshaft requires a cam retainer plate to prevent the camshaft from "walking" back and forth in the block. Standard Mark IV roller-style camshafts won't interchange. Camshaft Specs Hydraulic Roller Solid Roller Manufacturer Crane Cams Crane Cams PN 168761 16R000015 (custom) Duration @ 0.050 lift 230/236 degrees 246/252 degrees Valve Lift (1.7:1 rockers) 0.598/0.610-inch 0.714/0.697-inch Lobe displacement angle 112 degrees 112 degrees « | 1 | 2 | 3 | 4 | 5 | 6 | » | View Full Article Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!