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Technical Articles for Part Number HRS-120973-12
Howards Cams Big Bottle Nitrous Oxide Mechanical Roller Camshafts 120973-12
Part Number: HRS-120973-12
Howards Cams Big Bottle Nitrous Oxide Mechanical Roller Camshafts
Camshaft, Mechanical Roller Tappet, Advertised Duration 309/323, Lift .737/.731, Chevy, Big Block, Each
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Estimated Ship Date: Dec 30, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
120973-12
Part Type:
Product Line:
Summit Racing Part Number:
HRS-120973-12
UPC:
840793105748
Cam Style:
Solid roller, Retro-fit
Camshaft Use:
Drag race
Camshaft Manufacturers Description:
Rough idle, great mid to top-end performer. Needs good heads, 250+ nitrous oxide system.
Basic Operating RPM Range:
4,500-7,500
Intake Duration at 050 inch Lift:
277
Exhaust Duration at 050 inch Lift:
291
Duration at 050 inch Lift:
277 int./291 exh.
Advertised Intake Duration:
309
Advertised Exhaust Duration:
323
Advertised Duration:
309 int./323 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.737 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.731 in.
Valve Lift with Factory Rocker Arm Ratio:
0.737 int./0.731 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 Big Bottle Nitrous Oxide Mechanical Roller Camshafts
Cubes on juice need Big Bottle cams from Howards Cams! Their nitrous oxide mechanical roller camshafts offer precision-ground, high-grade, race-quality cores to ensure top performance. These Howards nitrous cams are serious cams for serious street to all-out racing applications engineered with custom-designed lobes for 250 hp and above. Are you looking for maximum performance? Match your N2O with these bottle-built Big Bottle nitrous oxide mechanical roller camshafts from Howards Cams and enjoy the ride!
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Some parts are not legal for use in California or other states with similar laws / regulations
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