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COMP Cams 21-243-4 Magnum 253/253 Hydraulic Flat Camshaft Chrysler 383-440

(Chrysler 300 1959-71, Town & Country 1959-77, Newport 1959-78, New Yorker 1959-78, Imperial 1959-75, Cordoba 1975-78, Saratoga 1959-60 + 100 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

21-243-4
6 reviews
Sale Price

$309.95

Estimated ship date Wednesday, November 25

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Product Details

The COMP Cams Magnum 21-243-4 camshaft delivers proven performance gains for Chrysler 383-440 big block engines without the excessive wear associated with more aggressive profiles. This hydraulic flat tappet camshaft features a 253/253 duration rating, making it an excellent choice for street/strip applications where reliability and performance must coexist.

Key Features:

  • 253° intake and exhaust duration for balanced performance
  • Hydraulic flat tappet design for quiet, reliable operation
  • Optimized for engines with 9.5:1 or higher compression ratios
  • Delivers strong high-RPM power while maintaining valvetrain durability
  • Works best with aftermarket higher stall torque converters
  • Compatible with mild ratio rocker arms and traditional performance valve springs
  • Specifically engineered for Chrysler 383-440 cubic inch big block V8 engines

This Magnum series camshaft is ideal for high-compression builds that need to effectively bleed off cylinder pressure while maximizing top-end power. The conservative lobe profile ensures excellent performance without needlessly stressing valvetrain components, making it perfect for engines that see frequent use. When paired with appropriate supporting modifications including a higher stall converter and quality valve springs, the 21-243-4 transforms your Mopar big block into a responsive, powerful engine that's equally at home on the street or at the strip.

Products specifications

Fits

Chrysler 300 1959-71, Town & Country 1959-77, Newport 1959-78, New Yorker 1959-78, Imperial 1959-75, Cordoba 1975-78, Saratoga 1959-60, Ford 300 1959-71, Windsor 1959-61; Dodge Charger 1966-78, Challenger 1970-74, Dart 1960-69 + 95 more models

Advertised Exhaust Duration

305

Advertised Intake Duration

305

Basic Operating RPM Range

3,500-6,500

Grind Number

305H

Cam Type

Hydraulic Flat Tappet

Engine Family

Chrysler 383-440 c.i. 8 Cylinder (1959-1980)

Exhaust Valve Lift

0.525

Intake Valve Lift

0.525

Exhaust Duration at .050 inch Lift

253

Camshaft Material

Cast Iron

Cam and Lifter Kit Upgrade

CL21-243-4

K-Kit Upgrade

K21-243-4

Camshaft Series

Magnum

SK-Kit Upgrade

SK21-243-4

AMAZON ASIN

B001O0FWWQ

Assembly Lubricant Included

Yes

Camshaft Gear Attachment

1-Bolt

Lifters Included

No

LOBE SEPARATION

110

Valve Springs Required

Yes

Lifter Type

Hydraulic Flat Tappet

Prop 65

WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov

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. 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.

Usage

Street/Strip

Intake Duration at .050 Inch Lift

253

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I bought this item for my fiance and he loves it! He was completely happy with the price we paid...

Best prices I found online.. processed same day and recieved same week..packaged great and works great.

Wow I love the race ramps I bought for my 2009 dodge challenger srt8 I used Thelm to change the oil 2 days after I got Thelm and they worked great I have extra clearance I wouldnt think of any other place for my parts gas shipping great prices and great shipping prices I'm a very happy customer

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