Pontiac V8 265-455 1955-1981
Adv Duration: 280/288
Duration @ .050": 227/235
Lift: .525/.530
Included Lifters: 91466 Hyd. Roller
1800-5200, Rattler, choppy idle, high performance street, stock converter ok, best with 1800+ and gears

Pontiac V8 265-455 1955-1981
Adv Duration: 288/296
Duration @ .050": 235/243
Lift: .530/.530
Included Lifters: 91466
2000-5400, Big Mama Rattler, lopey idle, street or street/strip, needs 9.0:1 compression, 2500+ stall

Pontiac V8 265-455 1955-1981
Adv Duration: 296/304
Duration @ .050": 243/251
Lift: .530/.515
Included Lifters: 91466 Hyd. Roller
2400-5600, Big Daddy Rattler, rough idle, pro street or street/strip, needs 9.5:1 compression, 2800+