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COMP Cams 51-221-4 Xtreme Energy Hydraulic Flat Tappet Camshaft Pontiac - 265-455

(Pontiac GTO 1964-73, Firebird 1967-81, Grand Prix 1962-80, Grand Am 1973-75, 1978-80, Bonneville 1958-80, LeMans 1963-81, Catalina 1955-80 + 23 more models)

Part of: COMP Cams Xtreme Energy Hydraulic Flat Tappet Camshaft Ford

Other options in this family: COMP Cams 31-238-3 COMP Cams 35-238-3 COMP Cams 35-242-3 COMP Cams 51-222-4 COMP Cams 31-242-3

Manufacturer

Picture for manufacturer COMP Cams

Part Number

51-221-4
7 reviews
Sale Price

$309.95

In Stock (10+)

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Product Details

The COMP Cams Xtreme Energy 51-221-4 hydraulic flat tappet camshaft is designed specifically for Pontiac V8 engines ranging from 265 to 455 cubic inches. This performance camshaft delivers a significant boost in power and torque over stock camshafts, making it an excellent choice for street/strip applications and muscle car restorations.

Camshaft Specifications:

  • Advertised Duration: 268°/280° intake/exhaust
  • Duration at .050": 212°/218° intake/exhaust
  • Valve Lift: .447"/.465" intake/exhaust (with 1.5:1 rocker ratio)
  • Lobe Separation Angle: 110°
  • Hydraulic flat tappet design for quiet operation and easy maintenance
  • Recommended RPM range: 1,500-5,500

Key Features:

  • Xtreme Energy lobe profiles provide excellent midrange and top-end power
  • Improved throttle response and acceleration throughout the RPM range
  • Compatible with factory valve springs and components in most applications
  • Choppy idle sound for aggressive performance character
  • Designed for use with stock or aftermarket intake manifolds and headers

This camshaft works well in street-driven Pontiac vehicles with mild compression ratios (9.0:1 to 10.0:1) and produces a noticeable improvement in performance while maintaining reasonable vacuum for power brakes. It's ideal for GTOs, Firebirds, Trans Ams, and other classic Pontiac muscle cars. Requires compatible valve springs and proper break-in procedures for optimal performance and longevity.

Products specifications

Fits

Pontiac GTO 1964-73, Firebird 1967-81, Grand Prix 1962-80, Grand Am 1973-75, 1978-80, Bonneville 1958-80, LeMans 1963-81, Catalina 1955-80, Tempest 1961-70, Ventura 1960-61, 1971-75, 1977, Parisienne 1967-68, 1972-74 + 20 more models

Basic Operating RPM Range

1,000-5,200

Grind Number

XE256H

Cam Type

Hydraulic Flat Tappet

Intake Valve Lift

0.447

Exhaust Valve Lift

0.455

Camshaft Material

Cast Iron

Cam and Lifter Kit Upgrade

CL51-221-4

K-Kit Upgrade

K51-221-4

SK-Kit Upgrade

SK51-221-4

AMAZON ASIN

B000CEO7J4

Engine Family

Pontiac 265-455 C.I. 8 Cylinder (1955-1981)

Usage

Street/Performance

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.

Advertised Exhaust Duration

268

Intake Duration at .050 Inch Lift

212

Advertised Intake Duration

256

Exhaust Duration at .050 inch Lift

218

Camshaft Series

Xtreme Energy

Autoplicity had the lowest price by far and shipping was very fast (ordered Wednesday evening, arrived Saturday morning). I will definitely order from Autoplicity again!

Very pleasant order over the phone. Gentleman was smart, cheerful and helpful.

Good price

Just what you want from a merchant but don't expect; fast, courteous service and attention to the details of your order. I'm a happy consumer. Thank you, Autoplicity. I'll be back.

Autoplicity cares about there customers. I ordered a flash programmer and got to the last page and never got a confirmation of the order. I used the website chat and talked to somebody about it right away. So I ordered again and got a conformation. But both went though. Autoplicity called me next day a.m. to see if I made a mistake. Thanks for letting me know and correcting to one order. Saved me from shipping back a product I dind't need.

Good products with low prices. Easy website and pament options.

Exact product as promised with the best price on the internet. Product shipped fast and had a tracking number to keep me up to date on my order. I would order from again without hesitation and will tell friends.

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