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Howards Cams Mechanical Flat Tappet 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.
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
Hard protective packaging
Part Type: Camshaft
Application: Chevrolet BB Mark IV 396-502 1965-1996
Ignition Firing Order: 1-8-7-3-6-5-4-2
Cam Style: 4/7 Swap Mechanical Flat Tappet
Basic RPM Range: 3000-6800
Manufacturers Description: Rough idle, good mid to upper range performance. 3000+ stall, 11.5:1+ CR.
Intake Duration @ .050": 252
Exhaust Duration @ .050": 260
Advertised Intake Duration (@ .006"): 287
Advertised Exhaust Duration (@ .006"): 295
Intake Valve Lift with OE Rocker Ratio (1.70): .618"
Exhaust Valve Lift with OE Rocker Ratio (1.70): .640"
Intake Lobe Lift: .363"
Exhaust Lobe Lift: .376"
Intake Valve Lift with 1.72 Rocker Ratio: .624"
Intake Valve Lift with 1.75 Rocker Ratio: .635"
Intake Valve Lift with 1.80 Rocker Ratio: .653"
Exhaust Valve Lift with 1.72 Rocker Ratio: .647"
Exhaust Valve Lift with 1.75 Rocker Ratio: .658"
Exhaust Valve Lift with 1.80 Rocker Ratio: .677"
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: 124902-12
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.
Note: Ignition firing order must be changed to 1-8-7-3-6-5-4-2. |