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Technical Articles for Part Number HRS-121153-10
Howards Cams Steel Billet Mechanical Roller Camshafts 121153-10
Part Number: HRS-121153-10
Howards Cams Steel Billet Mechanical Roller Camshafts
Camshaft, Mechanical Roller Tappet, Advertised Duration 281/287, Lift .663/.680, Chevy, Big Block, Each
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Estimated Ship Date: Dec 31, 2026 Would you rather pick it up?
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Overview
Brand:
Manufacturer's Part Number:
121153-10
Part Type:
Product Line:
Summit Racing Part Number:
HRS-121153-10
UPC:
840793106004
Cam Style:
Solid roller, Retro-fit
Camshaft Use:
Street/Strip
Camshaft Manufacturers Description:
Good midrange horsepower, rough idle. Needs 11.0:1 compression ratio and up.
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:
281
Advertised Exhaust Duration:
287
Advertised Duration:
281 int./287 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.663 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.680 in.
Valve Lift with Factory Rocker Arm Ratio:
0.663 int./0.680 exh.
Lobe Separation (degrees):
110
Camshaft Gear Attachment:
3-bolt
Intake Valve Lash:
0.022 in.
Exhaust Valve Lash:
0.022 in.
Remanufactured:
No
Computer-Controlled Compatible:
No
Valve Springs Required:
Yes
Quantity:
Sold individually.
Howards Cams Steel Billet Mechanical Roller Camshafts
Howards Cams steel billet mechanical roller camshafts are serious cams for serious performance. Cut from billet steel these high-grade, race-quality mechanical roller cams from Howards are ground on precision equipment to ensure awesome performance. Mechanical roller cams offer aggressive power for all-out competition. They're billet, they're Howards, and they're serious-- mechanical roller camshafts!
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Some parts are not legal for use in California or other states with similar laws / regulations
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