Chev SB 262-400 '55-'98

Adv. Duration: 279/297

Duration @ .050": 227/241

Valve Lift Intake: .479

Valve Lift Exhaust: .465

Lobe Separation: 107 LC

2000-5800, Thumper, high performance street, best with 2000+ conv.

Chev SB 262-400 '55-'98

Adv. Duration: 295/313
Duration @ .050": 243/257

Valve Lift Intake: .500

Valve Lift Exhaust: .486

Lobe Separation: 107 LC

2500-6400, Big Mutha' Thumper, performance street strip, 9.0:1+, 2500+ stall.

Chev SB 262-400 '55-'98

Adv. Duration: 287/305

Duration @ .050": 235/249

Valve Lift Intake: .489

Valve Lift Exhaust: .476

Lobe Separation: 107 LC

2100-6100, Mutha' Thumper, performance street, 2500+ stall.