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COMP Cams 11-252-4 Xtreme Marine Hydraulic Flat Camshaft Chevrolet Big Block - 254/264 396-454

(Chevrolet Camaro 1967-72, Corvette 1967-74, Impala 1967-76, Malibu 1967, 1973-75, C1500 1990-93, Chevelle 1967-73, Blazer 1973-74 + 105 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

11-252-4
4 reviews
Sale Price

$309.95

1 left at this price

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Product Details

The COMP Cams Xtreme Marine camshaft is specifically engineered for marine applications running Chevrolet Big Block engines from 396 to 454 cubic inches. This hydraulic flat tappet camshaft delivers a 254/264 degree duration profile designed to provide strong low-end torque and mid-range power, ideal for marine propulsion where reliability and consistent performance under load are critical.

Key Specifications:

  • Advertised Duration: 254 degrees intake / 264 degrees exhaust
  • Camshaft Type: Hydraulic flat tappet
  • Application: Chevrolet Big Block 396, 402, 427, 454 marine engines
  • Marine-specific grind optimized for propeller load characteristics
  • Designed for use with stock or mildly modified cylinder heads
  • Requires hydraulic flat tappet lifters (not included)

Features & Benefits:

  • Marine-duty grind profile compensates for constant load operation
  • Smooth idle quality suitable for enclosed engine compartments
  • Enhanced torque curve for improved hole shot and cruising performance
  • Compatible with stock fuel systems and compression ratios
  • Precision-ground on COMP Cams CNC equipment for exact lobe accuracy

This camshaft is part of COMP Cams' Xtreme Marine series, which features profiles specifically calibrated for the unique demands of marine propulsion. The conservative duration keeps powerband characteristics well-suited for the constant load and variable RPM conditions typical in boating applications, while still providing a noticeable performance improvement over stock profiles.

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 + 100 more models

Advertised Exhaust Duration

316

Advertised Intake Duration

298

Grind Number

XM298H

Cam Type

Hydraulic Flat Tappet

Intake Valve Lift

0.575

Exhaust Valve Lift

0.578

Intake Duration at .050 Inch Lift

254

Basic Operating RPM Range

3200-6,800

Camshaft Material

Cast Iron

Cam and Lifter Kit Upgrade

CL11-252-4

K-Kit Upgrade

K11-252-4

SK-Kit Upgrade

SK11-252-4

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

Usage

Marine

Exhaust Duration at .050 inch Lift

264

Engine Family

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

AMAZON ASIN

B000P5B5AO

Best price I could find, and free shipping. ..I am hoping to get the tank soon

Very satisfied! My intake shipped on Friday and I received it on Tuesday. Not only super fast shipping, but a great deal to boot!

I ordered a hitch off of this site for Christmas, I have never heard of it nor did I know how they were, but they are great! Got my package in I'd say 4 days, very fast and it was exactly what I wanted! Only down fall was they charged me 3 times and I was short 150$ for a few days. I got my money back and I would definitely order again.

Very good customer service asked about a lot of different springs and parts for my Mazdaspeed 3.

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