Ford 351C/351M/400 1970-1983
Adv. Duration: 270/278
Duration @ .050": 217/225
Valve Lift: .571/.577
Lobe Separation Angle: 110

Included Lifters: 91168 Hyd. Roller
1600-5600. Mild idle, great all around street, good low end torque & horsepower.

Ford 351C/351M/400 1970-1983
Adv. Duration: 278/282
Duration @ .050": 225/229
Lift: .546/.600

Lobe Separation: 110 LC
Included Lifters: 91168 Hyd. Roller
2000-6000. Mild lopey idle, Street/Mild Bracket, good low to mid-range power. 9.5:1+ CR.

Ford 351C/351M/400 
Adv. Duration: 270/278
Duration @ .050": 225/229
Lift: .546/.600

Lobe Separation: 112 LC
Included Lifters: 91168 Hyd. Roller
2000-6000. Fair idle, Street High Performance, good low to mid-range torque. 9.5:1+ CR, 2000+ stall.

Ford 351C/351M/400 1970-1983
Adv. Duration: 286/294
Duration @ .050": 233/241
Lift: .594/.611

Lobe Separation: 110 LC
Included Lifters: 91168 Hyd. Roller
2800-6400. Fair idle, Street/Strip, great power range. 3000+ stall, 10.0:1+ CR.

Ford 351C/351M/400 1970-1983
Adv. Duration: 286/294
Duration @ .050": 233/241
Lift: .594/.611

Lobe Separation: 112 LC
Includes Lifters: 91168 Hyd. Roller
2800-6400. Rough idle, Street/Bracket, good mid-range torque & upper end horsepower. 3200+ stall.

Ford 351C/351M/400 
Adv. Duration: 300/304
Duration @ .050": 247/251
Lift: .623/.623

Lobe Separation: 110 LC
Included Lifters: 91168 Hyd. Roller
3400-7000. Fair idle, Street/Strip, good mid-range power. 11.5:1+ CR, 3500+ stall.