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Technical Articles for Part Number HRS-117071-12
Howards Cams American Muscle Hydraulic Flat Tappet Camshafts 117071-12
Part Number: HRS-117071-12
Howards Cams American Muscle Hydraulic Flat Tappet Camshafts
Camshaft, American Muscle, Hydraulic Flat Tappet, Advertised Duration 256/262, Lift .390/.410, SBC
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Overview
Brand:
Manufacturer's Part Number:
117071-12
Part Type:
Product Line:
Summit Racing Part Number:
HRS-117071-12
UPC:
840793104680
Cam Style:
Hydraulic flat tappet
Camshaft Use:
Circle Track
Camshaft Manufacturers Description:
Smooth idle, near duplicate of Chevy L75 300 hp/327 camshaft, GM #3733431/3896929.
Basic Operating RPM Range:
600-4,800
Intake Duration at 050 inch Lift:
194
Exhaust Duration at 050 inch Lift:
203
Duration at 050 inch Lift:
194 int./203 exh.
Advertised Intake Duration:
262
Advertised Exhaust Duration:
256
Advertised Duration:
256 int./262 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.390 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.410 in.
Valve Lift with Factory Rocker Arm Ratio:
0.390 int./0.410 exh.
Lobe Separation (degrees):
112
Camshaft Gear Attachment:
3-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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