Chevrolet Big Block Adv. Duration: 269/279 Duration @ .050": 215/225 Lift: .516/.527 Lobe Separation: 112 LC Includes Lifters: 91111 Hyd. Flat Tappet 1200-5200. Street Force 2, Great low & mid-range torque. OK in heavy vehicle.
Chevrolet Big Block Adv. Duration: 285/285 Duration @ .050": 231/231 Lift: .510/.510 Lobe Separation: 110 LC Includes Lifters: 91111 Hyd. Flat Tappet 2000-6400. Noticeable idle, great with oval port heads.
Chevrolet Big Block Adv. Duration: 285/285 Duration @ .050": 231/231 Lift: .533/.533 Lobe Separation: 111 LC Included Lifters: 91111 Hyd. Flat Tappet 2000-6400. Street/Strip, lots of torque. Auto OK with 3.55+ gears.