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Howards Cams Hydraulic Roller Camshaft, 4/7 Swap
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 manageable 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
Hard protective packaging
Part Type: Camshaft
Application: Chevrolet Big Block Gen 6 454-502 1996-1999
Ignition Firing Order: 4/7 Swap (1-8-7-3-6-5-4-2)
Cam Style: Retro-Fit 4/7 Swap Hydraulic Roller
Basic RPM Range: 2000-6400
Manufacturers Description: Fair idle, hot street rod/strip. 10.0:1+, good intake & exhaust, 2400+ stall.
Intake Duration @ .050": 233
Exhaust Duration @ .050": 241
Advertised Intake Duration (@ .006"): 286
Advertised Exhaust Duration (@ .006"): 294
Intake Valve Lift with OE Rocker Ratio (1.75): .601"
Exhaust Valve Lift with OE Rocker Ratio (1.75): .618”
Intake Lobe Lift: .343
Exhaust Lobe Lift: .353"
Intake Valve Lift with 1.70 Rocker Ratio: .583"
Intake Valve Lift with 1.80 Rocker Ratio: .617"
Exhaust Valve Lift with 1.70 Rocker Ratio: .600"
Exhaust Valve Lift with 1.80 Rocker Ratio: .635"
Lobe Separation Angle: 112 Degrees
Intake Centerline: 108 Degrees
Lifters Included: No
Small Base Circle: No
Cam Gear Attachment: 3-Bolt
Valve Adjustment: Zero Lash Plus ˝ Turn
Manufacturer: Howards Cams & Racing Components
Manufacturer's Part Number: 133305-12
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: Ignition firing order must be changed to 1-8-7-3-6-5-4-2.
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