Howards Cams, Steel Billet Mechanical Roller Camshaft, Chev BB Mark IV 396-502, 261/269 @.050, .680/.680 112 LS |
| Item Number: HRC121133-12 |
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Howards Cams Steel Billet Mechanical Roller Camshafts
All Howards mechanical roller cams are ground on billet steel cores in house at Howards Cams. Mechanical roller cams are designed and mainly used in full competition applications. Real race conditions are extremely punishing to the valvetrain and the camshaft. So why would you use a cast core? No matter how good the heat-treatment, a cast core (SADI) will not provide the performance or durability of an American steel billet cam. Why are some cam companies using cast (SADI) cores? Lower cost, which equals higher profits. Howards Cams will not skimp on materials just for higher profits. Extreme conditions require better materials, better technology and better design. Better cam...great price! Made in the USA!
Manufactured on Dedicated High Precision Machines
Held to Strict Tolerances
High grade quality cores
Hard protective packaging
Part Type: Camshaft
Application: Chevrolet Big Block Mark IV 396-502 1965-1996
Ignition Firing Order: 1-8-4-3-6-5-7-2
Cam Style: Mechanical Roller
Basic RPM Range: 3400-7400
Manufacturers Description: Nice Bracket cam, lopey idle, needs higher stall. NOS OK.
Intake Duration @ .050": 261
Exhaust Duration @ .050": 269
Advertised Intake Duration (@ .006"): 293
Advertised Exhaust Duration (@ .006"): 301
Intake Valve Lift with OE Rocker Ratio (1.70): .680"
Exhaust Valve Lift with OE Rocker Ratio (1.70): .680"
Intake Lobe Lift: .400"
Exhaust Lobe Lift: .400"
Intake Valve Lift with 1.72 Rocker Ratio: .688"
Intake Valve Lift with 1.75 Rocker Ratio: .700"
Intake Valve Lift with 1.80 Rocker Ratio: .720"
Exhaust Valve Lift with 1.72 Rocker Ratio: .688"
Exhaust Valve Lift with 1.75 Rocker Ratio: .700"
Exhaust Valve Lift with 1.80 Rocker Ratio: .720"
Lobe Separation Angle: 112 Degrees
Intake Centerline: 108 Degrees
Lifters Included: No
Small Base Circle: No
Cam Gear Attachment: 3-Bolt
Valve Adjustment: .022/.022
Manufacturer: Howards Cams & Racing Components
Manufacturer's Part Number: 121133-12
Weight: 10.0 lbs.
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Each
Note: Stock (O.E.) valve springs cannot be used.
Note: Requires Thrust Button.
Note: Requires upgraded distributor gear/fuel pump pushrod. |
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