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Technical Articles for Part Number HRS-121133-12
Howards Cams Steel Billet Mechanical Roller Camshafts 121133-12
Part Number: HRS-121133-12
Howards Cams Steel Billet Mechanical Roller Camshafts
Camshaft, Mechanical Roller Tappet, Advertised Duration 293/301, Lift .680/.680, Chevy, Big Block, Each
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Estimated Ship Date: Oct 19, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
121133-12
Part Type:
Product Line:
Summit Racing Part Number:
HRS-121133-12
UPC:
840793105953
Cam Style:
Solid roller, Retro-fit
Camshaft Use:
Drag race
Camshaft Manufacturers Description:
Nice bracket cam, lopey idle, needs higher stall and lower gear. Nitrous oxide OK.
Basic Operating RPM Range:
3,400-7,400
Intake Duration at 050 inch Lift:
261
Exhaust Duration at 050 inch Lift:
269
Duration at 050 inch Lift:
261 int./269 exh.
Advertised Intake Duration:
293
Advertised Exhaust Duration:
301
Advertised Duration:
293 int./301 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.680 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.680 in.
Valve Lift with Factory Rocker Arm Ratio:
0.680 int./0.680 exh.
Lobe Separation (degrees):
112
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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