Description
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series’ early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes.
Resources
Installation Instructions
Resources
Installation Instructions
Specifications:
| Advertised Exhaust Duration | 313 |
| Advertised Intake Duration | 295 |
| Amazon ASIN | B002EE0FK0 |
| Assembly Lubricant Included | Yes |
| Basic Operating RPM Range | 2,500-6,400 |
| 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 and Lifter Kit Upgrade | CL20-602-4 |
| Cam Type | Hydraulic Flat Tappet |
| Camshaft Gear Attachment | 1-Bolt |
| Camshaft Material | Cast Iron |
| Camshaft Series | Thumpr |
| Description_ASM | Fits Chrysler 273, 318, 340 and 360 LA |
| Description_DEF | Engine Camshaft |
| Description_DES | Big Mutha’ Thumpr 243/257 Hydraulic Flat Cam for Chrysler 273-360 |
| Description_EXT | Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle. |
| Description_INV | BM-Thmpr 243/257 H-Flt Cam Chrys 273-360 |
| Description_KEY | 273, 360, 318, AMC, Dodge, Mopar, Plymouth, Dart, Road Runner, Charger, Challenger, 383, 400, 440, 426, HEMI, 426 Wedge, 426 HEMI, RB, B, HEMI, 392, Chrysler, LA |
| Description_MKT | Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series’ early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes. |
| Description_SHO | BMT 243/257 HFTChrLA |
| Description_SHP | None |
| Engine Family | Chrysler 273-360 c.i. 8 Cylinder (1964-2002) |
| Exhaust Duration at .050 inch Lift | 257 |
| Exhaust Valve Lift | 0.494 |
| Grind Number | 295TH7 |
| height | 2.75 |
| Intake Duration at .050 Inch Lift | 243 |
| Intake Valve Lift | 0.507 |
| K-Kit Upgrade | K20-602-4 |
| length | 24.5 |
| Lifter Type | Hydraulic Flat Tappet |
| Lifters Included | No |
| Lobe Separation | 107 |
| LTL | N |
| Title | Big Mutha’ Thumpr 243/257 Hydraulic Flat Cam for Chrysler 273-360 |
| Usage | Street/Strip |
| Valve Springs Required | Yes |
| weight | 9.6 |
| width | 3.0 |
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