Chevrolet Small Block Adv. Duration: 272/278 Duration @ .050": 244/250 Lift: .500/.500 Lobe Separation: 106 LC Included Lifters: 91118 Direct Lube Mech. Flat Tappet 3200-6600. Oval track, .500" lift rule, best on tight short tracks. Strong off corner.
Chevrolet Small Block Adv. Duration: 281/281 Duration @ .050": 246/246 Lift: .515/.515 Lobe Separation: 106 LC Included Lifters: 91118 Direct Lube Mech. Flat Tappet 3200-6700. Oval track, high torque, short track. Strong off corner.
Chevrolet Small Block Adv. Duration: 281/281 Duration @ .050": 246/246 Lift: .515/.515 Lobe Separation: 108 LC Included Lifters: 91118 Direct Lube Mech. Flat Tappet 2500-6200. Hot Street/Bracket. Good mid-range performance.
Chevrolet Small Block Adv. Duration: 281/287 Duration @ .050": 246/252 Lift: .520/.530 Lobe Separation: 106 LC Included Lifters: 91115 Mechanical Flat Tappet 2600-6500. Short Track profile, best on 1/4 to 3/8 mile tracks. 2 barrel OK.
Chevrolet Small Block Adv. Duration: 281/287 Duration @ .050": 246/252 Lift: .520/.530 Lobe Separation: 106 LC Included Lifters: 91118 Direct Lube Mech. Flat Tappet 2600-6500. Short Track profile, best on 1/4 to 3/8 mile tracks. 2 barrel OK.
Chevrolet Small Block Adv. Duration: 283/287 Duration @ .050: 248/252 Lift: .535/.530 Lobe Separation: 106 LC Included Lifters: 91115 Mech. Flat Tappet 3000-6800. Small Base Circle, Oval track, 2bbl. 1/4 to 3/8 tight, with good intake & exhaust.