Chevrolet Small Block Adv. Duration: 296/302 Duration @ .050": 243/249 Lift: .420/.420 Lobe Separation: 112 LC Included Lifters: 91112 Hyd. Flat Tappet 4000-7000. Oval Track Lift Rule, .420” Lift Rule with Vacuum Rule, 2bbl. or 4bbl., heavy car with manifolds. 3/8 to 1/2 banked. |