COMP CAM 11-600-8 THUMPR 227/241 Retro Fit Camshaft with HP Link Bar Lifters | LIFT: .547"/.530" | FITS: Chevrolet BBC Big Block 396 402 427 454 | Choppy Thumping Idle

Turn your Chevy 396–454 big block into a true Thumpr with this complete valvetrain package featuring the Competition Cams 11-600-8 Thumpr hydraulic roller camshaft, Redline Performance link-bar lifters and a billet steel double roller timing set. The 11-600-8 grind delivers .547"/.530" lift, 283°/303° advertised duration, 227°/241° @ .050 and a tight 107° lobe separation angle. This combination is designed to dramatically improve airflow and cylinder filling while delivering the aggressive Thumpr series exhaust note. The high lift opens the valves deep into the head’s high-efficiency flow zone, while the extended duration keeps them open long enough at peak velocity to build serious torque and horsepower from about 1,900–5,500 RPM. The 107° LSA creates significant overlap, which sharpens throttle response and produces the classic Thumpr choppy idle that sounds radical at every stoplight. With proper compression, gearing and converter, this cam delivers a very hard-hitting mid-range and strong street/strip performance while still being usable on pump gas. Redline Performance link-bar hydraulic roller lifters are included to match the cam’s aggressive lobe design ensuring stable roller control, good oiling and long lifter life at elevated spring pressures. The billet steel double roller timing set uses hardened gears and a dual-roller chain to keep cam timing precise, reduce stretch and protect your investment at high RPM. This kit is an excellent choice for big block–powered muscle cars, street rods and trucks where you want maximum sound and attitude along with real performance gains. If you want your Chevy 396–454 to hit hard, pull strong and have that unmistakable Thumpr lope, this Competition Cams 11-600-8 package with Redline lifters and a billet steel timing set is exactly what you’re looking for.

• THIS IS A COMP CAM & REDLINE USA CAM KIT ASSEMBLED BY OUR EXPERT ENGINEERS TO CREATE THE HIGHEST QUALITY CAMSHAFT KIT AT AN AFFORDABLE PRICE. EVERY PART IN THIS KIT HAS A HIGH-PERFORMANCE SPEC RATING AND IS GUARANTEED TO BE OF THE HIGHEST OF QUALITY AND PERFORMANCE.
• COMPETITION CAMS 11-600-8 THUMPR SPECS – Hydraulic roller cam for Chevy big block with 283°/303° advertised duration, 227°/241° @ .050 and .547"/.530" lift on a tight 107° LSA. Built for hard street performance and choppy Thumpr idle.
• REDLINE PERFORMANCE LINK-BAR HYDRAULIC ROLLER LIFTERS INCLUDED – Heavy-duty link-bar lifters designed for stability, improved oil control and reliable tracking on aggressive roller cam profiles. Built to handle higher lift, increased spring pressure and sustained RPM without lifter collapse or premature wear.
• .547"/.530" HIGH LIFT FOR BIG AIRFLOW GAINS – Aggressive valve lift moves the valves deep into the head’s high-flow region, dramatically improving intake charge and exhaust scavenging for more torque and horsepower throughout the RPM range.
• 227°/241° @ .050 FOR STRONG MID-RANGE PULL – Longer duration keeps the valves open during peak airflow, increasing cylinder filling and creating a hard-hitting mid-range with strong, clean pull to about 5,500 RPM on the street.
• 107° LSA = SIGNATURE THUMPR IDLE – Tight lobe separation builds overlap that delivers the famous Thumpr sound: a deep, choppy, thumping idle that makes your big block sound like a serious street/strip engine even at low RPM.
• PERFECT FOR STREET/STRIP ENTHUSIASTS WHO WANT SOUND + POWER – Expect explosive throttle response, a brutal lopey idle, stronger mid-range torque and a harder pull through the RPM band—perfect for classic muscle cars, hot rods and big block swaps.
• BUILT FOR CHEVY 396–454 BIG BLOCKS – Ideal for 396, 402, 427 and 454 big block Chevrolet street/strip builds with performance heads, headers, good exhaust and proper carb/EFI tuning. Designed as a retro-fit hydraulic roller profile. Winners Circle +1