Comp Cam 31-603-5 Mutha Thumpr 243/257 Camshaft Kit with HP Lifters, Double Roller Timing Set, Stage 2 Springs & 6.876″ Push Rods for 1969–1991 Ford 302 5.0L Engines – Radical Idle Street Cam
$699.00
Brand: REDLINE ENGINE SUPPLY
Condition: New
– THIS IS A COMPETITION CAM & ENGINETECH CAM KIT BUNDLE 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.
– TRUE 31-603-5 BIG MUTHA’ THUMPR CAM SPECS – Hydraulic flat tappet profile with 295/312 advertised duration, 243/257 duration at .050, .512/.497 lift and a tight 107° LSA. Produces extreme Thumpr lope and strong mid-range torque from 2,400–6,400 RPM.
– ENGINETECH PERFORMANCE HYDRAULIC LIFTERS INCLUDED – High-quality hydraulic lifters engineered for flat tappet cam profiles. Provides smooth operation, reliable oil control, and long-term valvetrain durability.
– TRUE DOUBLE ROLLER TIMING SET – Heavy-duty dual-roller timing chain improves cam timing accuracy, reduces stretch, and increases durability, ensuring consistent valve events and long-term reliability under performance conditions.
– STAGE 2 PERFORMANCE VALVE SPRINGS AND RETAINERS – Upgraded performance springs and retainers designed to handle the lift profile. Improves high-RPM stability, reduces valve float, and enhances durability for flat tappet SBF builds.
- 2 years warranty
- Delivery time: 1-2 business days
- Free 90 days return
Description
Description
This complete performance kit includes the Competition Cams 31-603-5 Big Mutha’ Thumpr hydraulic flat tappet camshaft, Enginetech hydraulic lifters, a true double roller timing set, Stage 2 performance valve springs and retainers, and a set of 6.876-inch push rods. Designed specifically for 1969–1991 non-roller hydraulic 302 engines, this kit transforms the sound and performance of the classic small block Ford. The 31-603-5 camshaft is one of the most aggressive flat tappet grinds available, featuring 295 and 312 degrees advertised duration, 243 and 257 degrees duration at .050, .512 and .497 inches of lift and a tight 107-degree lobe separation angle. These specs create significant valve overlap for the signature Big Mutha’ Thumpr choppy idle while improving cylinder scavenging and delivering harder mid-range acceleration.
The operating range of 2,400 to 6,400 RPM makes this camshaft ideal for street/strip builds that spend time in the mid and upper RPM ranges. The included double roller timing set improves cam timing accuracy and reduces chain stretch, helping maintain consistent valve timing at higher RPM. Stage 2 performance springs and retainers provide the strength and stability required to control the valvetrain under the cam’s high-lift, fast-ramp design. The 6.876-inch push rods ensure correct valvetrain geometry for non-roller 302 engines and add strength for performance use. Enginetech hydraulic lifters help maintain smooth operation and proper oil control under high load.
This kit is an excellent choice for hot rods, classic muscle cars, trucks and performance builds running 1969–1991 non-roller 302 engines. If you want a valvetrain package that drastically improves sound, throttle response and mid-range power, the 31-603-5 Big Mutha’ Thumpr kit delivers outstanding results.
Manufacturer: COMP CAMS / ENGINETECH
Model: SBF THUMPR 243/257
Included components: 1-CAMSHAFT 16-LIFTERS 1-TIMING SET 16-SPRINGS & RETAINERS 16-PUSH RODS
Warranty: 2 YEAR MANUFACTURER WARRANTY
Additional information
Additional information
| Brand | REDLINE ENGINE SUPPLY |
|---|---|
| Condition | New |
| Manufacturer | COMP CAMS / ENGINETECH |
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