×
Account Login
1-800-345-4545
Gift Cards
Order Status & Returns
Help Center

COMP Cams Mutha" Thumpr Hydraulic Flat Tappet Camshaft and Lifter Kit Lift .489"/.476" Duration 287/305 RPM Range 2200 to 6100

249-CL12-601-4


Product Q&A
View Now
Click image to zoom
Mutha" Thumpr Hydraulic Flat Tappet Camshaft and Lifter Kit Lift .489"/.476" Duration 287/305 RPM Range 2200 to 6100
$371.95
More than 10 available
Mutha' Thumpr Hydraulic Flat Tappet Camshaft and Lifter Kit
Lift .489"/.476"
Duration 287/305
RPM Range 2200 to 6100
Free Shipping - Ships
QTY

Items You May Also Consider

Ratings
Price
Brand
CL12-601-4 - Comp Cams Thumpr Hydraulic Flat Tappet Cams is rated 3.7 out of 5 by 3.
Rated 5 out of 5 by from perfect i have owned all 3 cams in this series for sbc. The muthathumpr is my favorite. in a .40 over 350 202 heads and flat top pistons, and sounds great with open headers. so happy.
Date published: 2014-11-22
Rated 1 out of 5 by from Cam and lifters failed right from first fire! Coated everything with the lube that came with it had penngrade break in oil in it also chewed 2 lifters right off the bat not very happy
Date published: 2019-10-03
  • y_2025, m_5, d_11, h_10
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.42
  • cp_1, bvpage1
  • co_hasreviews, tv_1, tr_2
  • loc_en_US, sid_10001_10001_994488, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_jegs

Will I need to change push rods?

Asked by: Fatboytroy
The Comp 249-CL12-601-4 cam kit will work with stock push rods.
Answered by: jshook
Date published: 2025-04-23

With this cam do I need a stall converter 

Asked by: Kendallracing
The Comp 249-CL12-601-4 cam kit will need a 2500 stall.
Answered by: jshook
Date published: 2025-03-25

Will this work on a 80s stock 350? 

Asked by: Jarrett
The Comp 249-CL12-601-4 cam kit will work on an '80's 350 engine.
Answered by: jshook
Date published: 2025-03-24

I Have a 402 Big Block Chevy Bored 60 With Dom Pistons Will The Cam Work For Me

Asked by: Big Block Chevy
The Comp 249-CL12-601-4 cam kit is for small block Chevy engines.
Answered by: jshook
Date published: 2025-03-19

I have a 1977 Chevy 305 with a stock compression ratio around 8.2:1 - 8.5:1 if I get the 981-16 valve springs could I run this cam? 

Asked by: Jake2003
The Comp 249-CL12-601-4 cam uses Comp 981-16 springs.
Answered by: jshook
Date published: 2025-03-05

Will the Big Muther Thumper work on a stock 1972 350 engine?

Asked by: 72Monte
COMP Cams CL12-601-4 will work on 72 350 with upgraded Valve Springs.
Answered by: Seth
Date published: 2025-01-14

Will this cam work with  stock 327 just curious about the compression part says 9-1 but a stock 327 has 10.5:1

Asked by: Joseph
COMP Cams 249-CL12-601-4 requires a minimum of 9:1 compression. This cam will work for a 327 if you upgrade your valve springs.
Answered by: Seth
Date published: 2024-11-04

Will this cam work with stock throttle body and computer on a 92 gmc 1500 350ci

Asked by: Bc86
The Comp 249-CL12-601-4 cam kit does not work with '92 C1500 EFI.
Answered by: jshook
Date published: 2023-11-03
  • y_2025, m_5, d_12, h_9CST
  • bvseo_bulk, prod_bvqa, vn_bulk_3.0.42
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_14
  • loc_en_US, sid_10001_10001_994488, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_jegs

Related Products

Complete Camshaft Kit3 Grinds To Fit All Of Your Performance NeedsLong Exhaust DurationProduces A Powerful Hard-Hitting Exhaust NoteExcellent Horsepower Gains And Broad Torque CurveDelivers Real Seat Of The Pants PerformanceDesigned For Use w/Latest In ValveTrain Components1 Year Limited WarrantyChevelle, Camaro, ...
Close
Nitrided265, 283, 307, 302, 305, 327, 350, 383, 400, 427, L46, L48, L65, LM1, LT-1, L82, L81, LS9, L83, L98, L05, LG3, LG4, LT1, LT4, Camaro, Corvette, Chevelle, Stingray, Silverado, C10, Firebird, Chevrolet, Chevy, Small Block Chevy, Caprice, Malibu, Impala, ...
Close
Complete Kit3 Grinds To Fit All Of Your Performance NeedsLong Exhaust DurationProduces A Powerful Hard-Hitting Exhaust NoteExcellent Horsepower Gains And Broad Torque CurveDelivers Real Seat Of The Pants PerformanceDesigned For Use w/Latest In ValveTrain Components1 Year Limited Warranty265, 283, 307, ...
Close
Some parts are not legal for use in California or other states with similar laws / regulations

Motor Vehicles

WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.

Tools:

WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

Electrical Cords

WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.