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Howards Cams 4/7 Swap Hydraulic Roller Camshaft
By switching the firing order (1-8-7-3-6-5-4-2) on your favorite Chev V8, you will discover a broader, smoother torque curve and decrease in crankshaft deflection. More aggressive profiles can be used to get the most managable horsepower available. These cams require no additional engine modifications, other than swapping the #4 ignition wire with #7.
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 Roller
Basic RPM Range: 1800-5600
Manufacturers Description: 4/7 Swap, Fair idle, performance street, broad usable power range.
Intake Duration @ .050": 225
Exhaust Duration @ .050": 229
Advertised Intake Duration (@ .006"): 278
Advertised Exhaust Duration (@ .006"): 282
Intake Valve Lift with OE Rocker Ratio (1.60): .560"
Exhaust Valve Lift with OE Rocker Ratio (1.60): .555"
Intake Lobe Lift: .350"
Exhaust Lobe Lift: .347"
Intake Valve Lift with 1.65 Rocker Ratio: .578"
Intake Valve Lift with 1.70 Rocker Ratio: .595"
Intake Valve Lift with 1.72 Rocker Ratio: .602"
Exhaust Valve Lift with 1.65 Rocker Ratio: .573"
Exhaust Valve Lift with 1.70 Rocker Ratio: .590"
Exhaust Valve Lift with 1.72 Rocker Ratio: .597"
Lobe Separation Angle: 110 Degrees
Intake Centerline: 106 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: 514825-10
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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