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From the manufacturer
Be Loud. Get Noticed
If you're a true performance enthusiast, you just can't help be a little envious when you hear a Thumpr cam by COMP Cams. Nothing turns heads at a car show or a cruise-in than the sound of a hard hitting, high performance idle.
The COMP Cams engineering team called upon 30+ years of design experience to develop the Thumpr series of camshafts. The result of this effort is a series of performance camshafts that deliver the ultimate in modern performance and an incredible exhaust note.
Great Sound. Great Performance
The Sound
COMP Thumpr camshafts use an early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
Performance
COMP developed the Thumpr, Mutha' Thumpr and Big Mutha' Thumpr cam grinds to not only make a great idle sound but also to produce a significant gain both horsepower in torque.
The dyno chart to the left is a 350 c.i. 290 hp GM crate engine with 180cc/64cc chamber RHS heads, COMP High Energy lifters, COMP Magnum 1.52 Rockers, Weiand Dual Plane Intakes, 750 Holley Carburetor, 1.75" Hooker Headers with Magnum Race Mufflers.
Unique Grinds for Unique Rides
COMP has three different grinds for different performance applications from lower compression builds to higher compression engines in cars with looser torque converters and lower gear ratios.
COMP offers the Thumpr, Mutha' Thumpr and Big Mutha' Thumpr to handle applications from pump gas street cars to high compression applications. All offer a thumping idle with great performance.
Big Sound. Big Power
- Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.
- Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
- Best with aftermarket converters and more rear gear.
- Available with lifters in 'CL' Kits, with lifters and a gear drive in 'GK' kits or in an all-inclusive complete kit as a 'K' kit.
COMP Cams offers four levels of complete component-matched kits that deliver unbeatable performance
Thumpr CamOur Thumpr cams are available individually in either a Thumpr, Mutha' Thumpr or Big Mutha' Thumpr grind. Designed to accommodate a wide range of applications. |
Thumpr Cam and Lifter KitNew flat tappet cams require new lifters. Our Thumpr camshaft line is available in 'CL' kit configuration which include a camshaft, a set of lifters, instructions and installation lubricant. Add CL to the beginning of the desired part number. |
Thumpr Gear Drive KitFor the ultimate in classic hot rod sound, we offer our Thumpr cams in a kit that include a gear drive. While the Thumpr provides a choppy idle, the gear drive gives your engine a whining blower sound for the ultimate in timing accuracy, durability and hot rod sound. Add GK to the beginning of the desired part number. |
Thumpr K-KitCOMP's K-Kits provide an all-inclusive solution for the customer looking for a kit that includes everything needed for a COMPlete valvetrain solution. Our K-Kits include a Thumpr cam, a set of High Energy lifters, Magnum timing set, valve springs, chromemoly retainers, valve locks, seals along with instructions and installation lubricant. Add K to the beginning of the desired part number. |
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| Thumpr | Mutha' Thumpr | Big Mutha' Thumpr | |
| Performance Characteristics | High performance street, stock converter ok, best with 2,000+ converter and gears. Choppy/thumping idle. | High performance street/strip, needs 9:1 compression, 2,500+ stall, intake, gears and headers, rough idle. | Street/Strip, needs 9.5:1 compression, 2,800+ stall, intake, gears and headers, very rough idle. |
| RPM Operating Range | 2,000 to 5,800 | 2,200 to 6,100 | 2,500 to 6,400 |
| Advertised Duration (INT/EXH) | 279/297 | 287/305 | 295/313 |
| Duration at .050" (INT/EXH) | 227/241 | 235/249 | 243/257 |
| Valve Lift w/ 1.5 Rocker (INT/EXH) | .479"/.465" | .489"/.476" | .500"/.486" |
| Lobe Separation Angle | 107 | 107 | 107 |
| CL-Kit | CL12-600-4 | CL12-601-4 | CL12-602-4 |
| GK Kit | GK12-600-4 | GK12-601-4 | GK12-602-4 |
| K-Kit | K12-600-4 | K12-601-4 | K12-602-4 |
| Made in the U.S.A. | ✓ | ✓ | ✓ |
Returns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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