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COMP Cams Camshaft Kit CS 299T HR-107 B

SKU: CCAGK12-602-8

Camshaft Kits

CCA Camshaft Kits...

COMP Cams Camshaft Kit CS 299T HR-107 B

SKU: CCAGK12-602-8

Camshaft Kits

CCA Camshaft Kits...

A$3,299.75
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Description

Big Mutha' Thumpr 243/257 Hydraulic Roller Cam

Product Overview

Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305's and 350's from the mid 80's forward. Camaros/Firebirds/Corvettes received the roller cams early, but many trucks and SUV's had flat tappet cams until the mid 90's. Remove the intake or timing cover to confirm whether the block is a factory roller or flat tappet. Does not fit the LS1, LS2, LS3 or any LS-based 4.8, 5.3, 5.7, 6.0 and 6.2. 1955-1957 Chevrolet 265 engines require a groove on the 5th cam journal for oiling. Contact us for more information.

Product Details

Advertised Exhaust Duration:319
Advertised Intake Duration:299
Amazon ASIN:B002EE76DE
Basic Operating RPM Range:2,500-6,200
C.A.R.B. E.O. Number:N/A
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 Federally Certified Vehicles Manufactured Before 1967?: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. Exempt for Racing and Off-Road Only Vehicles?:Yes, but must be a race/competition only vehicle.
C.A.R.B. Exemption Reason:N/A
California Proposition 65:WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
Cam Type:Hydraulic Roller
Camshaft Series:Thumpr
Description:Big Mutha' Thumpr 243/257 Hydraulic Roller Cam GK-Kit for Chevrolet Small Block
Engine Family:Chevrolet 262-400 c.i. 8 Cylinder (1958-1998)
Exhaust Duration @ .050 in.:243
Exhaust Duration at .050 inch Lift:257
Exhaust Duration:299
Exhaust Valve Lift(in):0.517
Exhaust Valve Lift:0.517
Gaskets Included:No
Intake Duration @ .050 in.:257
Intake Duration at .050 Inch Lift:243
Intake Duration:319
Intake Valve Lift(in):0.531
Intake Valve Lift:0.531
K-Kit Upgrade:K12-602-8
Kit Type:GK-Kit - Cam and Gear Kit
Lifter Type:Hydraulic Roller
Lifters Included:Yes
Locks Included:No
Part Number:ccaGK12-602-8
Pushrods Included:No
RPM Range:2000-9000
Retainers Included:No
Timing Chain and Gears Included:Yes
Title:Big Mutha' Thumpr 243/257 Hydraulic Roller Cam GK-Kit for Chevrolet Small Block
Usage:Street/Strip
Valve Stem Seals Included:No

Application Summary

Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305's and 350's from the mid 80's forward. Camaros/Firebirds/Corvettes received the roller cams early, but many trucks and SUV's had flat tappet cams until the mid 90's. Remove the intake or timing cover to confirm whether the block is a factory roller or flat tappet. Does not fit the LS1, LS2, LS3 or any LS-based 4.8, 5.3, 5.7, 6.0 and 6.2. 1955-1957 Chevrolet 265 engines require a groove on the 5th cam journal for oiling. Contact us for more information.

Part Type

Engine Camshaft Kit

Data: v4.2 - Upd: 2026-10-13 17:41:10

Specifications

Product Attributes - Brand
COMP Cams
Product Attributes - Manufacturer's Part Number
GK12-602-8
Product Attributes - Part Type
Camshaft Kits
Product Attributes - Product Line
COMP Cams Thumpr Hydraulic Roller Cam and Lifter Kits
Product Attributes - UPC
036584183327
Product Attributes - Cam Style
Hydraulic roller, Retro-fit
Product Attributes - Basic Operating RPM Range
2,500-6,200
Product Attributes - Camshaft Use
Street/Strip
Product Attributes - Intake Duration at 050 inch Lift
243
Product Attributes - Exhaust Duration at 050 inch Lift
257
Product Attributes - Duration at 050 inch Lift
243 int./257 exh.
Product Attributes - Advertised Intake Duration
299
Product Attributes - Advertised Exhaust Duration
319
Product Attributes - Advertised Duration
299 int./319 exh.
Product Attributes - Intake Valve Lift with Factory Rocker Arm Ratio
0.531 in.
Product Attributes - Exhaust Valve Lift with Factory Rocker Arm Ratio
0.517 in.
Product Attributes - Valve Lift with Factory Rocker Arm Ratio
0.531 int./0.517 exh.
Product Attributes - Lobe Separation (degrees)
107
Product Attributes - Camshaft Gear Attachment
3-bolt
Product Attributes - Grind Number
299T HR-107
Product Attributes - Computer-Controlled Compatible
No
Product Attributes - Lifters Included
Yes
Product Attributes - Lifter Style
Hydraulic roller
Product Attributes - Valve Springs Included
No
Product Attributes - Retainers Included
No
Product Attributes - Locks Included
No
Product Attributes - Valve Stem Seals Included
No
Product Attributes - Timing Chain and Gears Included
Yes
Product Attributes - Timing Chain Style
Gears
Product Attributes - Assembly Lubricant Included
Yes
Product Attributes - Pushrods Included
No
Product Attributes - Rocker Arms Included
No
Product Attributes - Gaskets Included
No
Product Attributes - Valve Springs Required
Yes
Product Attributes - Quantity
Sold as a kit.

Reference Information

Brand Name/s Comp Cams
StreetFX SKU ccaGK12-602-8
SFX Item ID 4123507
Supplier Item Code 4123507
Manufacturer SKU GK12-602-8
Manufacturer UPC 36584183327
Alternative References l46, l48, l65, lm1, lt-1, l82

Compatibility

Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305's and 350's from the mid 80's forward. Camaros/Firebirds/Corvettes received the roller cams early, but many trucks and SUV's had flat tappet cams until the mid 90's. Remove the intake or timing cover to confirm whether the block is a factory roller or flat tappet. Does not fit the LS1, LS2, LS3 or any LS-based 4.8, 5.3, 5.7, 6.0 and 6.2. 1955-1957 Chevrolet 265 engines require a groove on the 5th cam journal for oiling. Contact us for more information.

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