Chev BB Mark IV 396-502 '65-'96
Adv. Duration: 279/296Duration @ .050": 227/241
Valve Lift Intake: .498
Valve Lift Exhaust: .483
Lobe Separation: 107 LC
1800-5600, Thumper, High Performance, Street, Best with 2000+ Converter.
Adv. Duration: 287/304Duration @ .050": 235/249
Valve Lift Intake: .510
Valve Lift Exhaust: .495
2000-5900, Mutha' Thumper, Performance Street/Strip, 2500+ stall.
Hydraulic Flat Tappet Cam & Lifters BBC243/257 @ .0500.522/0.507107°2300-6200 RPM Mutha Thumpr