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Technical Articles for Part Number HRS-417591-15
Howards Cams American Muscle Hydraulic Flat Tappet Camshafts 417591-15
Part Number: HRS-417591-15
Howards Cams American Muscle Hydraulic Flat Tappet Camshafts
Camshaft, American Muscle, Hydraulic Flat Tappet, Advertised Duration 288/302, Lift .408/.408, Pontiac, V8
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Estimated Ship Date: Dec 28, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
417591-15
Part Type:
Product Line:
Summit Racing Part Number:
HRS-417591-15
UPC:
840793113798
Cam Style:
Hydraulic flat tappet
Camshaft Use:
Street/Strip
Camshaft Manufacturers Description:
Near duplicate of the Pontiac 390 hp/428 cam, GM #9779068.
Basic Operating RPM Range:
1,800-5,200
Intake Duration at 050 inch Lift:
212
Exhaust Duration at 050 inch Lift:
225
Duration at 050 inch Lift:
212 int./225 exh.
Advertised Intake Duration:
288
Advertised Exhaust Duration:
302
Advertised Duration:
288 int./302 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.408 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.408 in.
Valve Lift with Factory Rocker Arm Ratio:
0.408 int./0.408 exh.
Lobe Separation (degrees):
115
Remanufactured:
No
Computer-Controlled Compatible:
No
Valve Springs Required:
Yes
Quantity:
Sold individually.
Howards Cams American Muscle Hydraulic Flat Tappet Camshafts
Howards Cams American Muscle hydraulic flat tappet camshafts feature a design that replicates some of the most iconic OE camshaft-grinds from the '60s and early '70s. Howards took these fantastic grinds and made slight changes to the ramp speeds and minor duration changes for better reliability and horsepower without affecting the throttle response and the original-style exhaust rumble. Howards Cams manufactures the American Muscle hydraulic flat tappet camshafts designed for your application on dedicated, high-precision cam grinding machines to strict tolerances.
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