COMP Cams 12-601-8 Mutha’ Thumpr Hydraulic Roller Camshaft Kit w/Redline Retro Fit Lifters & Billet Timing Set for Chevy SBC 283 305 327 350 400 Thumping Idle 235/249 .521/.507 107° LSA

Features

• LIFETIME WARRANTY IF INSTALLED BY A CERTIFIED MACHINIST
• Complete Performance Kit Includes the COMP Cams 12-601-8 Mutha Thumpr hydraulic roller camshaft, Redline Performance retro-fit link-bar roller lifters, and a Billet Double Roller Timing Set for total valvetrain and timing upgrade.
• Correct Mutha Thumpr Specs 235 intake / 249 exhaust @ .050", .521"/.507" lift, and a tight 107 LSA deliver brutal mid-range torque, crisp throttle response, and the unmistakable choppy Thumpr idle.
• 2,2005,900 RPM Powerband Designed for serious street/strip power with hard acceleration, fast ramp rates, and a wide torque curve that pulls through every gear.
• Signature Mutha Thumpr Sound The narrow 107 lobe separation creates aggressive valve overlap, producing the deep, rough, race-inspired idle that makes this cam legendary.
• Billet Double Roller Timing Set Precision-machined billet steel sprockets and a true double-roller chain maintain exact cam timing, eliminate stretch, and improve durability at high RPM.
• Redline Performance Retro-Fit Lifters Included Converts older small-block Chevy engines to modern roller reliability with no machining, spider trays, or dogbones required.
• Built for Real Performance Builds Performs best with 9.5:1+ compression, aluminum heads, headers, free-flowing intake, and a 2,500+ stall converter for maximum power and attitude.
• Why You Should Buy This Kit This is not just a camshaftits a full performance transformation. You get the sound everyone wants, the torque every street car needs, and the reliability every builder demands.

Description

The COMP Cams 12-601-8 Mutha’ Thumpr Hydraulic Roller Camshaft Kit with Redline Performance Retro-Fit Lifters and a Billet Double Roller Timing Set delivers the exact combination of sound, torque, and durability that every small-block Chevy enthusiast wants. Designed for SBC 283, 305, 327, 350, and 400 engines, this setup transforms a mild street car into a street/strip machine with a voice you can hear from blocks away. The heart of the kit is COMP’s Mutha’ Thumpr camshaft, engineered with 235°/249° duration @ .050", .521"/.507" lift, and a 107° Lobe Separation Angle. These specs are what create the iconic Mutha’ Thumpr attitude. The tight LSA increases valve overlap for that deep, choppy idle while generating high cylinder pressure for explosive mid-range torque. The 2,200–5,900 RPM operating range ensures your engine pulls hard off the line and keeps pulling through the top end. This kit includes a Billet Double Roller Timing Set, ensuring the camshaft stays perfectly phased at all RPM. Billet sprockets and a precision roller chain eliminate timing stretch, increase durability, and improve overall power consistency. The Redline Performance Retro-Fit Link-Bar Lifters give you modern roller cam reliability even in older non-roller SBC blocks. No machining and no factory roller hardware needed—simply drop them in and go. When you fire it up, the engine sounds alive: that legendary Thumpr lope, the hard-hitting torque, the throttle response that makes every gear feel stronger. Perfect for Camaros, Chevelles, Novas, C10s, and street rods, this cam kit isn’t just an upgrade—it’s a full identity change for your engine.

Brand: REDLINE ENGINE SUPPLY

Material: Alloy Steel

Item dimensions L x W x H: 24 x 14 x 4 inches

Item Weight: 2 Pounds

Bearing Number: 12-601-8

Brand Name: REDLINE ENGINE SUPPLY

Bearing Number: 12-601-8

Bearing Type: Roller Bearing

UPC: 649762344740

Part Number: 12-601-8 RCF350-16 7100

Manufacturer: COMP CAM \ REDLINE USA

Included Components: Guaranteed to fit and meet the specifications of the OE parts being replaced

Item Dimensions: 24 x 14 x 4 inches

Item Weight: 2 Pounds

Material Type: Alloy Steel

Compatible Lubricant: Oil

Specification Met: ISO 9001