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COMP Cams SK11-556-4 Nitrous HP Hydraulic Flat Camshaft Kit for Chevy 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

SK11-556-4
11 reviews
Sale Price

$402.76

Estimated ship date Monday, November 23

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Product Details

The COMP Cams SK11-556-4 Nitrous HP hydraulic flat tappet camshaft kit is engineered for big block Chevrolet engines (396-454 cubic inches) running nitrous oxide systems. This performance camshaft features a 218/230 duration split designed to optimize power delivery under nitrous activation while maintaining strong naturally aspirated performance.

Camshaft Specifications:

  • Advertised Duration: 274°/286° intake/exhaust
  • Duration @ .050": 218°/230° intake/exhaust
  • Valve Lift: .477"/.510" intake/exhaust (with 1.7 rocker ratio)
  • Lobe Separation Angle: 110°
  • Hydraulic flat tappet design for reliable operation
  • Optimized for nitrous oxide applications

Complete SK-Kit Includes:

  • High-performance hydraulic flat tappet camshaft
  • Hydraulic lifter set (16 pieces)
  • Timing chain and gear set
  • COMP Cams assembly lube
  • Installation instructions
  • COMP Cams decals

This camshaft delivers strong mid-range to top-end power, making it ideal for street/strip applications with nitrous systems ranging from 100-250 horsepower shots. The aggressive exhaust duration helps scavenge cylinder pressure during nitrous activation while the tighter intake duration maintains good cylinder pressure for nitrous efficiency. Recommended operating range is 1,800-6,200 RPM with a power band optimized for 3,000-6,000 RPM.

Compatible with stock torque converters (2,200-2,800 stall recommended for best performance) and requires valve spring upgrades for proper operation. This kit provides everything needed for a complete cam swap except pushrods, which should be measured and ordered separately based on your specific engine build.

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

Cam Type

Hydraulic Flat Tappet

Kit Type

SK-Kit - Small Kit

Intake Valve Lift

0.505

Exhaust Valve Lift

0.52

Camshaft Material

Cast Iron

Camshaft Series

Nitrous HP

AMAZON ASIN

B001GF3N8O

Assembly Lubricant Included

Yes

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.

Gaskets Included

No

Advertised Intake Duration

262

Camshaft Gear Attachment

3-Bolt

LOBE SEPARATION

113

Locks Included

No

Exhaust Duration at .050 inch Lift

230

Lifters Included

Yes

Retainers Included

No

Timing Chain and Gears Included

Yes

Usage

Street/Strip

Intake Duration at .050 Inch Lift

218

Valve Stem Seals Included

No

Pushrods Included

No

Engine Family

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

Awesome price! I couldn't find a better bargain anywhere, and I searched for days.

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Good prices and user friendly site!

Fantastic price, positive communication, arrived before promised worked out great!

My experience with autoplicity was great. Great selection and service. Fast shipping. Will definitely use them again.

being this is a hard to find part.iam very pleased to find it in your store.

Helpful-reasonable prices-reasonable shipping-prompt.

Lowest prices and fast shipping made this a great transaction.

Good price, quick shipping, no instant refund though!

cheapest price, better than summitt or jegs too

Lowest price usually means sub-par customer service. Not the case at Autoplicity. I had questions after my item shipped, they responded promptly and professionally multiple times, and were totally willing to work with me. Very satisfying, would not hesitate to order from Autoplicity again.

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