Chevrolet BB Mark IV 396-502 1965-1996
Advertised Duration: 297/309
Duration @ .050": 265/277
Valve Lift w/1.70 Rockers: .703/.703
Lobe Separation Angle: 112
Intake Centerline: 108
4000-7000. Rough idle. Good upper RPM horsepower. Auto w/4000 stall. 11.0:1+.

Chevrolet BB Mark IV 396-502 1965-1996
Advertised Duration: 299/311
Duration @ .050": 267/279
Valve Lift w/1.70 Rockers: .714/.725
Lobe Separation Angle: 112
Intake Centerline: 108
4000-7000. Rough idle, aggressive upper rpm performance. 250+ plate systems, 11.0:1+ CR.

Chevrolet BB Mark IV 396-502 1965-1996
Advertised Duration: 307/317
Duration @ .050": 275/285
Valve Lift w/1.70 Rockers: .714/.714
Lobe Separation Angle: 112
Intake Centerline: 108
4300-7200. Good upper mid to top end for 500+. Use with large manifold systems.

Chevrolet BB Mark IV 396-502 1965-1996
Advertised Duration: 309/323
Duration @ .050": 277/291
Valve Lift w/1.70 Rockers: .737/.731
Lobe Separation Angle: 112
Intake Centerline: 108
4500-7500. Rough idle, great upper mid to top end performer. Needs good heads, 250+ systems.

Chevrolet BB Mark IV 396-502 1965-1996
Advertised Duration: 309/323
Duration @ .050": 277/291
Valve Lift w/1.70 Rockers: .810/.810
Lobe Separation Angle: 112
Intake Centerline: 108
4600-7800. 13.0:1+ compression. Good heads, 5000+ stall. Good with large manifold systems.

Chev BB Mark IV 396-502 1965-1996
Advertised Duration: 309/323
Duration @ .050": 277/291
Valve Lift w/1.70 Rockers: .810/.810
Lobe Separation Angle: 114
Intake Centerline: 110
4600-8000. 13.0:1+ compression. Good heads, 5000+ stall. Multi-stage systems.

Chevrolet BB Mark IV 396-502 1965-1996
Advertised Duration: 315/327
Duration @ .050": 283/295
Valve Lift w/1.70 Rockers: .765/.725
Lobe Separation Angle: 114
Intake Centerline: 110
4800-8500. Very large cubic inch with big multi-stage nitrous.

Chevrolet BB Mark IV 396-502 1965-1996
Cam Series: Big Bottle Cams - 4/7 Swap
Advertised Duration: 299/311
Duration @ .050": 267/279
Valve Lift w/1.70 Rockers: .714/.725
Lobe Separation Angle: 112
Intake Centerline: 108
4000-7000. Rough idle, aggressive upper RPM performance. 250+ plate systems, 11.0:1+ CR.

Chevrolet BB Mark IV 396-502 1965-1996
Big Bottle Cams - 4/7 Swap
Advertised Duration: 307/317
Duration @ .050": 275/285
Valve Lift w/1.70 Rockers: .714/.714
Lobe Separation Angle: 112
Intake Centerline: 108
4300-7200. Good upper mid to top end for 500+. Use with large manifold systems.

Chevrolet BB Mark IV 396-502 1965-1996
Cam Series: Big Bottle Cams - 4/7 Swap
Advertised Duration: 309/323
Duration @ .050": 277/291
Valve Lift w/1.70 Rockers: .810/.810
Lobe Separation Angle: 112
Intake Centerline: 108
4600-7800. Quick 16. Needs good heads. Multi-stage systems.

Chevrolet BB Mark IV 396-502 1965-1996
Cam Series: Big Bottle Cams - 4/7 Swap
Advertised Duration: 309/323
Duration @ .050": 277/291
Valve Lift w/1.70 Rockers: .810/.810
Lobe Separation Angle: 114
Intake Centerline: 110
4600-8000. 13.0:1+ compression. Good heads, 5000+ stall. Multi-stage systems.

Chevrolet BB Mark IV 396-502 1965-1996
Cam Series: Big Bottle Cams - 4/7 Swap
Advertised Duration: 313/331
Duration @ .050": 281/299
Valve Lift w/1.70 Rockers: .873/.810
Lobe Separation Angle: 115
Intake Centerline: 111
4600-8800. Large cubic inch w/multi-stage nitrous. Needs good heads & CR.