COMP CAM 11-601-4 MUTHA THUMPR 235/249 Hydraulic Camshaft Kit | HP Lifters | Double Roller Timing | Push Rods | LIFT: .510/.495 | FITS: Chevrolet BBC Big Block 454 7.4L 1970-1990 | Rough Idle

Description

If the standard Thumpr isn’t enough to scare the neighbors, it is time to step up to the Competition Cams 11-601-4 Mutha Thumpr Camshaft. Designed for the Big Block Chevy (396-454ci) owner who wants maximum intimidation, the Mutha Thumpr delivers a sound profile that is downright nasty. This isn’t a mild street cam; this is a high-performance hydraulic flat tappet grind engineered to make your Chevelle, Camaro, or Pro-Street truck sound like a dedicated drag car. If you want that heavy, chopping idle that shakes the ground and turns heads from three blocks away, this is the camshaft that delivers the goods.

The specs on the 11-601-4 take performance to the next level. Competition Cams engineered this profile with a massive Duration @ .050 of 235 intake and 249 exhaust, paired with a valve lift of .510”/.495”. This increased duration pushes the power band higher, dominating the 2,200 to 5,900 RPM range. This means you aren’t just making noise; you are making serious horsepower in the mid-to-upper RPM range. It is the ideal choice for modified engines with aftermarket intakes, headers, and free-flowing exhaust systems that can handle the increased airflow.

How does it feel? It feels violent. The signature 107-degree Lobe Separation Angle (LSA) combined with the increased overlap creates a rough, surging idle that vibrates the entire chassis. On the street, once you flash the converter, the power hits hard and pulls relentlessly to the redline. Critical Tech Note: Because of the aggressive duration, this cam produces lower vacuum than stock. It requires a 2,500+ RPM stall converter and performance rear-end gears (3.42-4.11) to drive properly. It is not compatible with a stock torque converter!

Why choose the Mutha Thumpr? Because you want the ultimate combination of sound and street/strip performance. Competition Cams created this series for hot rodders who refuse to compromise on attitude. You get the reliability of a hydraulic flat tappet setup with the audio profile of a radical solid lifter race engine. Don’t just build an engine; build a beast. Install the 11-601-4 Mutha Thumpr and own the loudest, meanest Big Block in town.

Manufacturer: COMP CAM / ENGINETECH
Model: MUTHA THUMPR 235/249
Included components: 1-CAMSHAFT 16-LIFTERS 1-TIMING SET 16-PUSH RODS
Warranty: LIFETIME – IF INSTALLED BY A CERTIFIED MACHINIST