Product Details
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| Cam and Lifter Kit Upgrade |
CL12-601-4 |
| K-Kit Upgrade |
K12-601-4 |
| C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967? |
Yes, but must meet tailpipe emission standards for year of vehicle. |
| AMAZON ASIN |
B002EE69M8 |
| Grind Number |
287TH7 |
| C.A.R.B. E.O. Number |
N/A |
| Engine Family |
Chevrolet 262-400 c.i. 8 Cylinder (1958-1998) |
| Assembly Lubricant Included |
Yes |
| Basic Operating RPM Range |
2,200-6,100 |
| Intake Valve Lift |
0.489 |
| C.A.R.B. Exempt for Racing and Off-Road Only Vehicles? |
Yes, but must be a race/competition only vehicle. |
| Lifter Style |
Hydraulic Flat Tappet |
| C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967? |
Yes, but must meet tailpipe emission standards for year of vehicle. |
| Cam, Lifter and Gear Drive Upgrade |
GK12-601-4 |
| Usage |
Street/Strip |
| C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965? |
Yes, but must meet tailpipe emission standards for year of vehicle. |
| Intake Duration at .050 Inch Lift |
235 |
| Camshaft Gear Attachment |
3-Bolt |
| Lobe Separation |
107 |
| Camshaft Series |
Thumpr |
| Camshaft Material |
Cast Iron |
| Title |
Mutha' Thumpr 235/249 Hydraulic Flat Cam for Chevrolet Small Block |
| Exhaust Valve Lift |
0.476 |
| Advertised Intake Duration |
287 |
| C.A.R.B. Exemption Reason |
N/A |
| C.A.R.B. Exempt for On-Road Vehicles? |
No |
| Exhaust Duration at .050 inch Lift |
249 |
| California Proposition 65 |
WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov |
| Advertised Exhaust Duration |
305 |
| Lifter Type |
Hydraulic Flat Tappet |
| Cam Type |
Hydraulic Flat Tappet |
| Lifters Included |
No |
| Valve Springs Required |
Yes |
| Part Terminology |
Engine Camshaft |
Features & Benefits
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Mutha' Thumpr 235/249 Hydraulic Flat Cam for Chevrolet Small Block 262-400. High performance street/strip, needs 9:1 compression, 2500+ stall, intake, Gears and headers, rough idle.
Application Summary
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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.
