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COMP Cams 11-556-4 Nitrous HP Hydraulic Flat Tappet Camshaft Big Block Chevy 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

11-556-4
8 reviews
Sale Price

$309.95

Estimated ship date Wednesday, November 25

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Product Details

The COMP Cams 11-556-4 Nitrous HP camshaft is a high-performance hydraulic flat tappet camshaft specifically engineered for nitrous oxide applications in Chevrolet big block engines (396-454 cubic inches). This camshaft features aggressive duration specs of 218/230 degrees at .050" lift, designed to maximize power output when running nitrous systems while maintaining reliability with hydraulic lifters.

Key Specifications:

  • Advertised Duration: 272°/284° intake/exhaust
  • Duration at .050": 218°/230° intake/exhaust
  • Valve Lift: .477"/.501" intake/exhaust (with 1.7:1 rocker ratio)
  • Lobe Separation Angle: 110°
  • Hydraulic flat tappet design for reduced maintenance
  • Optimized lobe profiles for nitrous oxide injection systems

Performance Features:

  • Designed specifically for nitrous HP applications with aggressive ramp rates
  • Broader powerband suitable for street/strip use with nitrous
  • Compatible with factory hydraulic lifters and valve train components
  • Tight lobe separation angle increases cylinder pressure and throttle response
  • Recommended RPM range: 1,500-6,000 RPM

This camshaft is ideal for big block Chevy engines utilizing nitrous oxide systems where maximum power gains are desired. Requires compatible hydraulic flat tappet lifters, performance valve springs, and proper valve train geometry. Best suited for engines with aftermarket heads, headers, and supporting modifications.

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

280

Basic Operating RPM Range

1,600-5,900

Grind Number

NX262H

Cam Type

Hydraulic Flat Tappet

Intake Valve Lift

0.505

Exhaust Valve Lift

0.52

Camshaft Material

Cast Iron

Cam and Lifter Kit Upgrade

CL11-556-4

K-Kit Upgrade

K11-556-4

Camshaft Series

Nitrous HP

SK-Kit Upgrade

SK11-556-4

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.

Advertised Intake Duration

262

Camshaft Gear Attachment

3-Bolt

LOBE SEPARATION

113

Exhaust Duration at .050 inch Lift

230

Usage

Street/Strip

Intake Duration at .050 Inch Lift

218

Engine Family

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

AMAZON ASIN

B000P592I6

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.

Need more specific details on item.

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.

Prices are good if u order more then one type of thing shipping goes way up

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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