About this product
This Howards Cams 417251-15 Pontiac American Muscle Hydraulic Flat Tappet Camshaft fits 265-455 cubic inch Pontiac engines from 1955-1981. Howards designed this camshaft as a near-duplicate of the Pontiac Ram Air III 366hp/400 cam (GM #9785744), and it features nice low to mid-range torque & horsepower, and has a smooth idle. A 9.5:1+ compression ratio and a 2200+ stall speed torque converter are highly recommended.
Howards Cams 417251-15 Pontiac American Muscle Hydraulic Flat Tappet Camshaft Specs:
- For Pontiac 265-455 engines from 1955-1981
- Basic RPM Range: 1800 to 5400
- Valve Lift Intake: .407
- Valve Lift Exhaust: .407
- Intake Duration: 301
- Exhaust Duration: 313
- Intake Duration at .050”: 224
- Exhaust Duration at .050”: 236
- Lobe Separation: 115
- Intake Centerline: 112
- Firing Order: 1-8-4-3-6-5-7-2
- Made in the USA
Note: Stock (O.E.) valve springs can NOT be used
Howards Cams designed this Hydraulic Flat Tappet camshaft for high performance on the street.
Howards Hydraulic Flat Tappet Cams - From mild to wild, they are the ultimate in performance!
Description supplied by Winners Circle through its current Shopify listing. Product, performance, and health claims are the seller’s and have not been independently verified by StorkScout.
