Chevrolet SB 262-400 1955-1998 Big Bottle Cams Adv. Duration: 307/317 Duration @ .050": 275/285 Lift: .630/.630 Lobe Separation: 114 Included Lifters: No 4400-8800. Small Base Circle, Competition profile, good top end power. Plate or plumbed.
Chevrolet BB Mark IV 396-502 1965-1996 Big Bottle Cams - 4/7 Swap Advertised Duration: 307/317 Duration @ .050": 275/285 Valve Lift w/1.70 Rockers: .714/.714 Lobe Separation Angle: 112 Intake Centerline: 108 4300-7200. Good upper mid to top end for 500+. Use with large manifold systems.