COMP Cams GK12-602-8 Big Mutha' Thumpr 243/257 Hydraulic Roller Cam GK-Kit for Chevrolet Small Block
GK12-602-8 Big Mutha' Thumpr 243/257 Hydraulic Roller Cam GK-Kit for Chevrolet Small Block
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SKU:COGK12-602-8
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Product Information
Big Mutha' Thumpr 243/257 Hydraulic Roller Cam

Product Information
Big Mutha' Thumpr 243/257 Hydraulic Roller CamTechnical Information
Features +
Genuine performance part backed by Engine Master Australia.
Specifications +
- Manufacturer
- COMP Cams
- MPN
- Not provided
- UPC
- 036584183327
- Our Part Number
- COGK12-602-8
Gaskets Included: No
Exhaust Valve Lift: 0.517
Exhaust Duration at .050 inch Lift: 257
Engine Family: Chevrolet 262-400 c.i. 8 Cylinder (1958-1998)
Camshaft Series: Thumpr
Cam Type: Hydraulic Roller
California Proposition 65: WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
Basic Operating RPM Range: 2,500-6,200
Valve Stem Seals Included: No
Amazon ASIN: B002EE76DE
C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?: Yes, but must be a race/competition only vehicle.
C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for On-Road Vehicles?: No
C.A.R.B. Exemption Reason: N/A
C.A.R.B. E.O. Number: N/A
Advertised Exhaust Duration: 319
Kit Type: GK-Kit - Cam and Gear Kit
Usage: Street/Strip
Timing Chain and Gears Included: Yes
Retainers Included: No
Pushrods Included: No
Locks Included: No
Lifters Included: Yes
Lifter Type: Hydraulic Roller
K-Kit Upgrade: K12-602-8
Intake Valve Lift: 0.531
Advertised Intake Duration: 299
Intake Duration at .050 Inch Lift: 243
Exhaust Valve Lift: 0.517
Exhaust Duration at .050 inch Lift: 257
Engine Family: Chevrolet 262-400 c.i. 8 Cylinder (1958-1998)
Camshaft Series: Thumpr
Cam Type: Hydraulic Roller
California Proposition 65: WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
Basic Operating RPM Range: 2,500-6,200
Valve Stem Seals Included: No
Amazon ASIN: B002EE76DE
C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?: Yes, but must be a race/competition only vehicle.
C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for On-Road Vehicles?: No
C.A.R.B. Exemption Reason: N/A
C.A.R.B. E.O. Number: N/A
Advertised Exhaust Duration: 319
Kit Type: GK-Kit - Cam and Gear Kit
Usage: Street/Strip
Timing Chain and Gears Included: Yes
Retainers Included: No
Pushrods Included: No
Locks Included: No
Lifters Included: Yes
Lifter Type: Hydraulic Roller
K-Kit Upgrade: K12-602-8
Intake Valve Lift: 0.531
Advertised Intake Duration: 299
Intake Duration at .050 Inch Lift: 243
Fitment +
Confirm compatibility with our team before ordering when your application is not listed.
Brand +
COMP Cams
COMP Cams develops performance camshafts and coordinated valvetrain components for a broad range of engine platforms. The range includes camshafts, lifters, valve springs, rocker systems, timing components and matched kits for street and competition builds.