American Motors L6 199-258/4.0L 1964-1995
Adv. Duration: 257/263
Duration @ .050": 203/209
Lift: .443/.448
Lobe Separation: 110 LC
Includes Lifters: Yes, 91711-12
1000-4400. Street Force 1, Mid street performance, strong low end torque. Not for Fuel Injection.

American Motors L6 199-258/4.0L 1964-1995
Adv. Duration: 269/269
Duration @ .050": 215/215
Lift: .475/.475
Lobe Separation: 112 LC
Includes Lifters: Yes, 91711-12
1400-5000. Moderate street with headers and better carb/intake. Not for fuel injection.

American Motors L6 199-258/4.0L 1964-1995
Adv. Duration: 275/275
Duration @ .050": 221/221
Lift: .501/.501
Lobe Separation: 108 LC
Includes Lifters: Yes, 91711-12
1800-5600. Fair idle, hot street, aftermarket induction & headers a must. Not for fuel injection.

American Motors L6 4.0L FI 1996-2006
Adv. Duration: 257/263
Duration @ .050": 203/209
Lift: .443/.448
Lobe Separation: 112 LC
Includes Lifters: Yes, 91711-12
1000-4400. Street Force™ 1, Good idle, mild street performance, strong low end torque.