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Technical Articles for Part Number HRS-121271-10
Howards Cams Hydraulic Flat Tappet Camshafts 121271-10
Part Number: HRS-121271-10
Howards Cams Hydraulic Flat Tappet Camshafts
Camshaft, Hydraulic Flat Tappet, Advertised Duration 303/309, Lift .595/.595, Chevy, Big Block, Each
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Estimated Ship Date: Dec 23, 2026 Would you rather pick it up?
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Overview
Brand:
Manufacturer's Part Number:
121271-10
Part Type:
Product Line:
Summit Racing Part Number:
HRS-121271-10
UPC:
840793106189
Cam Style:
Hydraulic flat tappet
Camshaft Use:
Street/Strip
Camshaft Manufacturers Description:
Rough idle, Pro Street/bracket, strong mid to top-end. 10.5:1 compression ratio, 3,200+ stall.
Basic Operating RPM Range:
3,000-7,000
Intake Duration at 050 inch Lift:
249
Exhaust Duration at 050 inch Lift:
255
Duration at 050 inch Lift:
249 int./255 exh.
Advertised Intake Duration:
303
Advertised Exhaust Duration:
309
Advertised Duration:
303 int./309 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.595 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.595 in.
Valve Lift with Factory Rocker Arm Ratio:
0.595 int./0.595 exh.
Lobe Separation (degrees):
110
Camshaft Gear Attachment:
3-bolt
Remanufactured:
No
Computer-Controlled Compatible:
No
Valve Springs Required:
Yes
Quantity:
Sold individually.
Howards Cams Hydraulic Flat Tappet Camshafts
Howards Cams offers their hydraulic flat tappet camshafts in a variety of configurations and performance levels for street, strip, and oval track purposes. All their flat tappet cams meet strict requirements to ensure the highest quality (and many get packaged and shipped in their unique, reusable, high-impact-plastic cases to ensure the quality reaches your doorstep.) Get the profile you want—from mild and smooth to loud and rough—with the hydraulic flat tappet camshafts from Howards Cams designed for your application.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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