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Howards Cams American Muscle Hydraulic Flat Tappet Camshaft & Lifter Set
Near duplicates of the most iconic original equipment camshaft grinds from the '60s to the early '70s. We took these fantastic grinds and made slight changes to the ramp speeds and minor duration 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. Camshaft and lifter sets include a Howards Cams performance camshaft, a matching set of Howards Cams premium lifters, and assembly lube.
Part Type: Camshaft & Lifter Set
Application: Oldsmobile 39° V8 400-455 1967-1990
Ignition Firing Order: OE (1-8-4-3-6-5-7-2)
Cam Style: Hydraulic Flat Tappet
Basic RPM Range: 800-4200
Manufacturers Description: Near duplicate of the Olds 310HP/350 cam (GM# 400084).
Intake Duration @ .050": 187
Exhaust Duration @ .050": 200
Advertised Intake Duration (@ .006"): 250
Advertised Exhaust Duration (@ .006"): 256
Intake Valve Lift with OE Rocker Ratio (1.60): .400"
Exhaust Valve Lift with OE Rocker Ratio (1.60): .400"
Intake Lobe Lift: .250"
Exhaust Lobe Lift: .250"
Intake Valve Lift with 1.65 Rocker Ratio: .412"
Intake Valve Lift with 1.70 Rocker Ratio: .425"
Intake Valve Lift with 1.72 Rocker Ratio: .430"
Exhaust Valve Lift with 1.65 Rocker Ratio: .412"
Exhaust Valve Lift with 1.70 Rocker Ratio: .425"
Exhaust Valve Lift with 1.72 Rocker Ratio: .430"
Lobe Separation Angle: 109 Degrees
Intake Centerline: 106 Degrees
Lifters Included: Yes, 91411, Performance Hydraulic Flat Tappet
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: CL517771-09
Weight: 10.0 lbs.
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Each
Note: Oil with ZDDP or ZDDP Additive Required.
Note: Stock (O.E.) valve springs cannot be used.
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