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Howards Cams American Muscle Hydraulic Flat Tappet Camshaft
Near duplicates of some of the most iconic original equipment camshaft grinds from the '60's to the early '70's. Howards Cams took these fantastic grinds and made slight changes to the ramp speeds and minor duation changes to give you better reliability and horsepower. You still get the same throttle response and of course the original style exhaust rumble. Great cams for restoration projects and perfect for the street machines.
Note: Always use Camshaft Break-In Lube with all new flat tappet cams.
Manufactured on Dedicated High Precision Machines
Held to Strict Tolerances
High grade quality cores
Rockwell Tested & Parkerized Ensuring the Highest Quality
Includes Matching Premium Lifters
Part Type: Camshaft
Application: Oldsmobile 39 Degree V8 260-455 1967-1990
Ignition Firing Order: OE (1-8-7-3-6-5-4-2)
Cam Style: Hydraulic Flat Tappet
Basic RPM Range: 800-4200
Manufacturers Description: American Muscle, Near duplicate of the Hurst/Olds 375HP/455 cam (GM #400117).
Intake Duration @ .050": 196
Exhaust Duration @ .050": 208
Advertised Intake Duration (@ .006"): 272
Advertised Exhaust Duration (@ .006"): 294
Intake Valve Lift with OE Rocker Ratio (1.60): .413"
Exhaust Valve Lift with OE Rocker Ratio (1.60): .414"
Intake Lobe Lift: .258"
Exhaust Lobe Lift: .259"
Intake Valve Lift with 1.65 Rocker Ratio: .426"
Intake Valve Lift with 1.70 Rocker Ratio: .439"
Intake Valve Lift with 1.72 Rocker Ratio: .444"
Exhaust Valve Lift with 1.65 Rocker Ratio: .427"
Exhaust Valve Lift with 1.70 Rocker Ratio: .440"
Exhaust Valve Lift with 1.72 Rocker Ratio: .445"
Lobe Separation Angle: 110 Degrees
Intake Centerline: 111 Degrees
Lifters Included: No
Small Base Circle: No
Cam Gear Attachment: Single-Bolt
Valve Adjustment: Zero Lash Plus 1/2 Turn
Manufacturer: Howards Cams & Racing Components
Manufacturer's Part Number: 517441-10
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.
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