Chevrolet Small Block Adv. Duration: 301/309 Duration @ .050: 266/274 Lift: .555/.555 Lobe Separation: 106 LC Included Lifters: 91118 Direct Lube Mech. Flat Tappet 4200-7400. Small Base Circle, Drag race with 12.0:1+ CR, 4800+ stall. Needs good heads & intake.
Chevrolet Small Block Adv. Duration: 303/313 Duration @ .050": 268/278 Lift: .574/.550 Lobe Separation: 106 LC Included Lifters: 91118 Direct Lube Mech. Flat Tappet 4000-7500. Serious competition only. Needs the best of everything.