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Technical Articles for Part Number HRS-120256-12
Howards Cams Hydraulic Roller Camshafts
Camshaft, Hydraulic Roller, Street/Strip, 284/288 Advertised Duration, 0.578/0.618 in. Lift, 112 LSA, 3-Bolt Gear, Chevy, Big Block, Each
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Estimated Ship Date: Dec 31, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
120256-12
Part Type:
Product Line:
Summit Racing Part Number:
HRS-120256-12
UPC:
840793105236
Cam Style:
Hydraulic roller, Retro-fit
Camshaft Use:
Street/Strip
Camshaft Manufacturers Description:
Fair idle, performance usage. Great midrange torque and horsepower.
Basic Operating RPM Range:
2,400-6,000
Intake Duration at 050 inch Lift:
231
Exhaust Duration at 050 inch Lift:
235
Duration at 050 inch Lift:
231 int./235 exh.
Advertised Intake Duration:
284
Advertised Exhaust Duration:
288
Advertised Duration:
284 int./288 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.578 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.618 in.
Valve Lift with Factory Rocker Arm Ratio:
0.578 int./0.618 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 Hydraulic Roller Camshafts
Howards Cams hydraulic roller camshafts are offered in a wide variety of profiles, from mild to wild. These units are precision-ground from race-quality cores, in-house, on dedicated cam-grinding machines. Each Howards Cams hydraulic roller camshaft is manufactured to the highest quality standards. Order the model designed for your vehicle and engine 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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