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Technical Articles for Part Number HRS-120665-12
Howards Cams Retrofit Hydraulic Roller Camshafts
Camshaft, Retrofit, Hydraulic Roller Tappet, Advertised Duration 296/302, Lift .640/.640, Chevy, Big Block
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Estimated Ship Date: Oct 22, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
120665-12
Part Type:
Product Line:
Summit Racing Part Number:
HRS-120665-12
UPC:
840793105564
Cam Style:
Hydraulic roller, Retro-fit
Camshaft Use:
Drag race
Camshaft Manufacturers Description:
Lopey idle, broad midrange power. 10.0:1 compression ratio, 3,000+ stall.
Basic Operating RPM Range:
3,000-6,500
Intake Duration at 050 inch Lift:
243
Exhaust Duration at 050 inch Lift:
249
Duration at 050 inch Lift:
243 int./249 exh.
Advertised Intake Duration:
296
Advertised Exhaust Duration:
302
Advertised Duration:
296 int./302 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.640 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.640 in.
Valve Lift with Factory Rocker Arm Ratio:
0.640 int./0.640 exh.
Lobe Separation (degrees):
112
Camshaft Gear Attachment:
3-bolt
Remanufactured:
No
Computer-Controlled Compatible:
No
Valve Springs Required:
Yes
Quantity:
Sold individually.
Notes:
Retrofit roller cam for engines that did not originally come with a roller cam.
Howards Cams Retrofit Hydraulic Roller Camshafts
Howards Cams retrofit hydraulic roller camshafts offer more lift and more power for less money. These street performance grinds are perfect for those wanting to upgrade to hydraulic roller cams. Manufactured using the highest grade race-quality cores, Howards precision-grinds their cams to provide the quality and performance that you want at a reasonable price. Overhaul your valvetrain for mild to wild street performance with Howards Cams retrofit hydraulic roller camshafts. Hundreds of models are available for a wide range of vehicles from the 1950s and up.
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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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