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COMP Cams 11-240-20 Xtreme Marine Nitride Hydraulic Flat Tappet Camshaft for Chevrolet Big Block 396-454

(Chevrolet Camaro 1967-72, Corvette 1967-74, Impala 1967-76, Malibu 1967, 1973-75, C1500 1990-93, Chevelle 1967-73, Blazer 1973-74 + 104 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

11-240-20
6 reviews
Sale Price

$422.95

Estimated ship date Tuesday, November 24

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Product Details

The COMP Cams 11-240-20 Xtreme Marine camshaft is specifically engineered for marine applications running Chevrolet Big Block 396-454 cubic inch engines. This hydraulic flat tappet camshaft features a nitride finish that provides exceptional wear resistance and durability in harsh marine environments where corrosion and extreme operating conditions are common.

Camshaft Specifications:

  • Advertised Duration: 280°/290° intake/exhaust
  • Duration @ .050": 234°/244° intake/exhaust
  • Valve Lift: .480"/.500" intake/exhaust (with 1.7:1 rocker ratio)
  • Lobe Separation Angle: 110°
  • RPM Range: 1,500-5,800 RPM
  • Hydraulic flat tappet design for reliable, low-maintenance operation

Key Features:

  • Nitride coating provides superior wear resistance and corrosion protection for marine use
  • Optimized for marine performance with strong mid-range torque and top-end power
  • Split-duration design provides enhanced exhaust scavenging
  • Compatible with stock torque converters and rear gears
  • Designed for use with performance valve springs (not included)

This camshaft delivers a noticeable performance improvement over stock while maintaining smooth idle characteristics suitable for marine applications. The Xtreme Marine series is ideal for ski boats, cruisers, and performance marine vessels requiring reliable power delivery across the RPM range.

Products specifications

Fits

Chevrolet Camaro 1967-72, Corvette 1967-74, Impala 1967-76, Malibu 1967, 1973-75, C1500 1990-93, Chevelle 1967-73, Blazer 1973-74, C10 Pickup 1968-74, Caprice 1967-76, C10 1975-80, El Camino 1967-75, Monte Carlo 1970-75 + 99 more models

Advertised Exhaust Duration

292

Basic Operating RPM Range

2,000-6,200

Grind Number

XM278H

Cam Type

Hydraulic Flat Tappet

Intake Valve Lift

0.564

Exhaust Valve Lift

0.566

Camshaft Material

Nitrided Cast Iron

Camshaft Series

Xtreme Marine

Assembly Lubricant Included

Yes

Lifters Included

No

LOBE SEPARATION

112

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.

Camshaft Gear Attachment

3-Bolt

Exhaust Duration at .050 inch Lift

244

Intake Duration at .050 Inch Lift

234

Usage

Marine

AMAZON ASIN

B002EDYMMI

Advertised Intake Duration

278

Engine Family

Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)

I recently needed head bolts for my 408 stroker motor that I'm building. I searched the Internet and Autoplicity had the ARP Head Bolts that I needed. Great price and quick shipping. Will definitely buy from again!!

easy to buy

Mazda cargo mat for the CX-9 SUV came within 1 week. Mat fits perfectly; just as described. Autoplicity had the best price listed for this product; we are very pleased.

Great prices for the springs I got. Def. the cheapest around! Everything was fast and straight forward.

I got all of my parts in and where happy with them. The website is about the cheapest around. Something about them really gives me a good feeling. :)

Super fast shipping,lowest price I could find, will buy from again.

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