Howards Cams Mechanical Flat Tappet Camshaft
From the humble beginnings to an industry leader today, Howards Cams has not forgotten the customer. Howards Cams main objective is to produce the highest quality product at a reasonable price. The name Howards Cams has been synonymous with high performance camshafts since 1945. A great number of valve train innovations can be traced back to Howards Cams. From pioneers in drag racing and oval track cams to cutting edge marine development, Howards Cams is at the forefront of the camshaft industry.
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 Big Block V8 Mark IV 396-402-427-454, '65-'96
Ignition Firing Order: OE (1-8-4-3-6-5-7-2)
Cam Style: Mechanical Flat Tappet
Basic RPM Range: 2600-6500
Manufacturers Description: Lopey idle, Street High Performance/Strip. Best with 3200 stall, 10.5:1 CR & 800+ cfm.
Intake Duration @ .050": 248
Exhaust Duration @ .050": 254
Advertised Intake Duration (@ .020"): 283
Advertised Exhaust Duration (@ .020"): 289
Intake Valve Lift with OE Rocker Ratio (1.70): .578"
Exhaust Valve Lift with OE Rocker Ratio (1.70): .623"
Intake Lobe Lift: .340"
Exhaust Lobe Lift: .366"
Intake Valve Lift with 1.72 Rocker Ratio: .585"
Intake Valve Lift with 1.75 Rocker Ratio: .595"
Intake Valve Lift with 1.80 Rocker Ratio: .612"
Exhaust Valve Lift with 1.72 Rocker Ratio: .629"
Exhaust Valve Lift with 1.75 Rocker Ratio: .640"
Exhaust Valve Lift with 1.80 Rocker Ratio: .659"
Lobe Separation Angle: 108 Degrees
Intake Centerline: 104 Degrees
Small Base Circle: No
Cam Gear Attachment: 3-Bolt
Valve Adjustment Intake: .022
Valve Adjustment Exhaust: .022
Manufacturer: Howards Cams & Racing Components
Manufacturer's Part Number: 121742-08
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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