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Technical Articles for Part Number HRS-257711-15
Howards Cams American Muscle Hydraulic Flat Tappet Camshafts 257711-15
Part Number: HRS-257711-15
Howards Cams American Muscle Hydraulic Flat Tappet Camshafts
Camshaft, Hydraulic Flat Tappet, Advertised Duration 288/308, Lift .486/.495, Ford, 352-428 FE, Each
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Overview
Brand:
Manufacturer's Part Number:
257711-15
Part Type:
Product Line:
Summit Racing Part Number:
HRS-257711-15
UPC:
840793112456
Cam Style:
Hydraulic flat tappet
Camshaft Use:
Street
Camshaft Manufacturers Description:
Near duplicate of the Ford 390 GT 335 hp/390 cam, Ford #C6OZ-6250-B.
Basic Operating RPM Range:
1,100-4,800
Intake Duration at 050 inch Lift:
206
Exhaust Duration at 050 inch Lift:
220
Duration at 050 inch Lift:
206 int./220 exh.
Advertised Intake Duration:
288
Advertised Exhaust Duration:
308
Advertised Duration:
288 int./308 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.486 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.495 in.
Valve Lift with Factory Rocker Arm Ratio:
0.486 int./0.495 exh.
Lobe Separation (degrees):
115
Camshaft Gear Attachment:
1-bolt
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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