Chevrolet W-Series 348-409 1958-1965
Advertised Duration: 286/294
Duration @ .050": 233/241
Valve Lift w/1.75 Rockers: .601/.618

Lobe Separation Angle: 112

Intake Centerline: 108

2000-6400. Fair idle, hot street rod/strip. 10.0:1+, good intake & exhaust, 2400+ stall.

Chevrolet W-Series 348-409 1958-1965
Advertised Duration: 282/286
Duration @ .050": 229/233
Valve Lift w/1.75 Rockers: .560/.572

Lobe Separation Angle: 110

Intake Centerline: 106

1800-6000. Nice idle, performance street. Best with improved intake & exhaust, 2000+ stall.

Chevrolet W-Series 348-409 1958-1965
Advertised Duration: 266/278
Duration @ .050": 213/225
Valve Lift w/1.75 Rockers: .525/.525

Lobe Separation Angle: 112

Intakes Centerline: 108
1400-5600. Good idle, street performance/daily driver. 9.0:1+ CR.