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 |