COMP Cams 20-603-9 Big Mutha' Thumpr 243/257 Hydraulic Roller Cam for Chrysler 273-360
20-603-9 Big Mutha' Thumpr 243/257 Hydraulic Roller Cam for Chrysler 273-360
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SKU:CO20-603-9
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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
- 036584150978
- Our Part Number
- CO20-603-9
Engine Family: Chrysler 273-360 c.i. 8 Cylinder (1964-2002)
Cam and Lifter Kit Upgrade: CL20-603-9
California Proposition 65: WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
K-Kit Upgrade: K20-603-9
Lifter Type: Hydraulic Roller
Amazon ASIN: B001GBMGNQ
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
10602: 299THR7
Camshaft Series: Thumpr
Usage: Street/Strip
Cam Type: Hydraulic Roller
Grind Number: 299THR7
Basic Operating RPM Range: 2,500-6,200
Intake Duration at .050 Inch Lift: 243
Exhaust Duration at .050 inch Lift: 257
Advertised Intake Duration: 299
Advertised Exhaust Duration: 319
Lobe Separation: 107
Intake Valve Lift: 0.533
Exhaust Valve Lift: 0.519
Lifters Included: No
Valve Springs Required: Yes
Assembly Lubricant Included: No
Camshaft Gear Attachment: 1-Bolt
Camshaft Material: Billet Steel
Cam and Lifter Kit Upgrade: CL20-603-9
California Proposition 65: WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
K-Kit Upgrade: K20-603-9
Lifter Type: Hydraulic Roller
Amazon ASIN: B001GBMGNQ
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
10602: 299THR7
Camshaft Series: Thumpr
Usage: Street/Strip
Cam Type: Hydraulic Roller
Grind Number: 299THR7
Basic Operating RPM Range: 2,500-6,200
Intake Duration at .050 Inch Lift: 243
Exhaust Duration at .050 inch Lift: 257
Advertised Intake Duration: 299
Advertised Exhaust Duration: 319
Lobe Separation: 107
Intake Valve Lift: 0.533
Exhaust Valve Lift: 0.519
Lifters Included: No
Valve Springs Required: Yes
Assembly Lubricant Included: No
Camshaft Gear Attachment: 1-Bolt
Camshaft Material: Billet Steel
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.