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Technical Articles for Part Number CCA-K12-423-8
COMP Cams Xtreme Energy Retrofit Cam and Lifter Kits
Cam/Lifters/Valvetrain, Hydraulic Roller Tappet, Adv. Duration 276/282, Lift .502/.510, Chevy, Small Block
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Estimated Ship Date: Monday 10/19/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
K12-423-8
Part Type:
Product Line:
Summit Racing Part Number:
CCA-K12-423-8
UPC:
036584031659
Cam Style:
Hydraulic roller, Retro-fit
Basic Operating RPM Range:
1,900-5,600
Camshaft Use:
Street/Strip
Intake Duration at 050 inch Lift:
224
Exhaust Duration at 050 inch Lift:
230
Duration at 050 inch Lift:
224 int./230 exh.
Advertised Intake Duration:
276
Advertised Exhaust Duration:
282
Advertised Duration:
276 int./282 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.502 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.510 in.
Valve Lift with Factory Rocker Arm Ratio:
0.502 int./0.510 exh.
Lobe Separation (degrees):
110
Grind Number:
CS XR276HR-10
Computer-Controlled Compatible:
No
Lifters Included:
Yes
Lifter Style:
Hydraulic roller
Valve Springs Included:
Yes
Outside Diameter of Outer Spring (in.):
1.430 in.
Retainers Included:
Yes
Locks Included:
Yes
Valve Stem Seals Included:
Yes
Timing Chain and Gears Included:
Yes
Timing Chain Style:
Double non-roller
Assembly Lubricant Included:
No
Pushrods Included:
No
Rocker Arms Included:
No
Gaskets Included:
No
Valve Springs Required:
No
Quantity:
Sold as a kit.
Notes:
Retro-fit: Designed for early non-roller blocks. Requires thrust button and wear plate.
COMP Cams Xtreme Energy Retrofit Cam and Lifter Kits
COMP Cams Xtreme Energy retrofit cam and lifter kits are built to take advantage of the latest cam technology, to provide maximum performance. Whether your use is off-roading, towing, or street performance, there is an Xtreme Energy kit available for you. By using an aggressive lobe profile, these kits provide better throttle response and more top-end horsepower than equivalent cams from other manufacturers, while delivering increased engine vacuum.
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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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