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Thumpr 227/241 Hydraulic Flat Cam for AMC 290-401

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UPC:
00036584212744
Availability:
This part ships direct from the manufacturer, lead times, stock and shipping may vary.
Weight:
10.14 LBS
$302.09

#SAVETHEFULLSIZEJEEP

A Portion Of The Proceeds From Your Purchase Supports The Development & Reproduction Of High Quality 1963-1991 Restoration Parts.

Thumpr 227/241 Hydraulic Flat Cam for AMC 290-401

Thumpr 227/241 Hydraulic Flat Cam for AMC 290-401

$302.09
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series' early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes.

Installation Instructions

Installation Instructions



This Part Fits:

YearMakeModelSubmodel
1974-1976JeepCherokeeBase
1977JeepCherokeeBase
1978-1983JeepCherokeeBase
1981-1982JeepCherokeeChief
1983JeepCherokeePioneer
1974JeepCherokeeS
1975-1977JeepCherokeeS
1978JeepCherokeeWide Track
1979-1980JeepCherokeeWide Track
1984-1991JeepGrand WagoneerBase
1984-1985JeepGrand WagoneerLimited
1971-1972JeepJ-100Base
1973JeepJ-100Base
1970JeepJ-2500Base
1971JeepJ-2500Base
1972-1973JeepJ-2500Base
1970-1973JeepJ-2600Base
1970-1971JeepJ-3800Base
1971-1972JeepJ-4500Base
1973JeepJ-4500Base
1971-1973JeepJ-4600Base
1971JeepJ-4700Base
1972-1973JeepJ-4700Base
1971JeepJ-4800Base
1972-1973JeepJ-4800Base
1974JeepJ10Base
1975JeepJ10Base
1976JeepJ10Base
1977-1988JeepJ10Base
1974JeepJ20Base
1975JeepJ20Base
1976-1978JeepJ20Base
1979-1988JeepJ20Base
1972-1982JeepWagoneerBase
1982-1983JeepWagoneerBrougham
1973-1975JeepWagoneerCustom
1976JeepWagoneerCustom
1979-1983JeepWagoneerLimited


Advertised Exhaust Duration296
Advertised Intake Duration279
ApplicationsFits AMC 290, 304, 343, 360, 390 and 401
Assembly Lubricant IncludedYes
Basic Operating RPM Range2,000-5,800
C.A.R.B. E.O. NumberN/A
C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for On-Road Vehicles?No
C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?Yes, but must be a race/competition only vehicle.
C.A.R.B. Exemption ReasonN/A
California Proposition 65WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
Cam and Lifter Kit UpgradeCL10-600-5
Cam TypeHydraulic Flat Tappet
Camshaft Gear Attachment1-Bolt
Camshaft MaterialCast Iron
Camshaft SeriesThumpr
DescriptionHigh performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle.
Engine FamilyAmerican Motors 290-401 c.i. 8 Cylinder (1966-1991)
Exhaust Duration at .050 inch Lift241
Exhaust Valve Lift0.476
Grind Number279TH7
Intake Duration at .050 Inch Lift227
Intake Valve Lift0.491
K-Kit UpgradeK10-600-5
Lifter TypeHydraulic Flat Tappet
Lifters IncludedNo
Lobe Separation107
UsageStreet/Strip
Valve Springs RequiredYes

To submit a return or exchange request, please go to our Contact Us page to submit order information. Photos of any damaged products may be requested and required to process any full or partial refund. If approved, we will provide you with an RMA number along with a return label for shipping.

Parts returned that are not defective, are subject to a 25% restocking charge. JeepRecyclers.com/McDaniel Motor Co. is NOT responsible for any parts that have been altered, modified, disassembled, or damaged by misuse or an accident subsequent to the parts purchase.

Reconditioned parts come with a minimum warranty of 90 days, unless otherwise stated (Refer to product listing for warranty duration). The warranty is void if the parts are not returned in the same condition in which they are sold. Warranties for aftermarket parts are covered by the manufacturer.

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For orders delivered within the continental US where reason for return isn't a result of a JeepRecyclers.com/McDaniel Motor Co. error, the cost of the initial shipping charge and a return fee will be deducted from your refund. A prepaid shipping label(s) will be provided. The flat fee for each item being returned can be found in the chart below:

Retail cost of the item Per Item Return Fee
Less than $25.00 $3.75
From $25.00-$49.99 $5.75
From $50.00-$99.99 $7.75
More than $100.00 $9.75

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