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COMP Cams 26-601-7 Thumpr Hydraulic Flat Tappet Camshaft Chrysler Hemi - for 392

(1957-1958 Chrysler 300; 1957-1958 Chrysler Town & Country; 1957-1958 Chrysler Newport; 1957-1958 Chrysler New Yorker; 1957-1958 Chrysler Imperial + 1 more model)

Part of: COMP Cams Thumpr Hydraulic Flat Tappet Camshaft Ford

Other options in this family: COMP Cams 35-600-4 COMP Cams 34-600-5 COMP Cams 20-600-4 COMP Cams 21-600-5 COMP Cams 92-600-5

Manufacturer

Picture for manufacturer COMP Cams

Part Number

26-601-7
4 reviews
Sale Price

$499.95

Estimated ship date Monday, November 23

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Product Details

The COMP Cams 26-601-7 Classic Thumpr camshaft delivers aggressive idle sound and strong mid-range performance for vintage Chrysler 392 cubic inch early Hemi V8 engines. This hydraulic flat tappet camshaft features a 235/249 degree advertised duration split designed to produce the signature loping idle characteristic of the Thumpr cam series while maintaining drivability for street use.

Camshaft Specifications:

  • Advertised Duration: 235° intake / 249° exhaust
  • Duration at .050": 207° intake / 221° exhaust
  • Valve Lift: .425" intake / .442" exhaust (with 1.5:1 rocker ratio)
  • Lobe Separation Angle: 113°
  • Hydraulic flat tappet design for original-style lifter compatibility
  • Optimized for engines producing 1,500-5,500 RPM operating range

Performance Characteristics:

  • Aggressive choppy idle with classic hot rod sound
  • Strong acceleration from off-idle through mid-range
  • Suitable for street-driven applications with manual or automatic transmissions
  • Recommended for engines with 9.0:1 to 10.5:1 compression ratio
  • Works with stock or mild aftermarket cylinder heads

This camshaft is specifically ground for the early Chrysler 392 Hemi engine and requires proper break-in procedures using COMP Cams break-in lubricant. The Thumpr series is engineered for enthusiasts who want maximum idle attitude without sacrificing streetability. Compatible with stock valve springs or COMP Cams recommended upgrade springs for optimal performance and reliability.

Products specifications

Fits

1957-1958 Chrysler 300; 1957-1958 Chrysler Town & Country; 1957-1958 Chrysler Newport; 1957-1958 Chrysler New Yorker; 1957-1958 Chrysler Imperial; 1957-1958 Chrysler Ford 300

Advertised Exhaust Duration

304

Basic Operating RPM Range

2,200-6,100

Grind Number

287TH7

Cam Type

Hydraulic Flat Tappet

Exhaust Valve Lift

0.483

Intake Valve Lift

0.498

Exhaust Duration at .050 inch Lift

249

Camshaft Material

Cast Iron

Engine Family

Chrysler 392 HEMI 8 Cylinder (1957-1958)

Camshaft Series

Classic Thumpr

AMAZON ASIN

B005H89VW8

Assembly Lubricant Included

Yes

Lifters Included

No

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.

Intake Duration at .050 Inch Lift

235

LOBE SEPARATION

107

Usage

Street/Strip

Advertised Intake Duration

287

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