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COMP Cams 11-678-20 Xtreme Energy Solid Flat Tappet Camshaft Big Block Chevy 396-454

Manufacturer

Picture for manufacturer COMP Cams

Part Number

11-678-20
7 reviews
Sale Price

$422.95

1 left at this price

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Usually delivered within 2 days

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Product Details

The COMP Cams Xtreme Energy 11-678-20 is a high-performance solid flat tappet camshaft designed specifically for Chevrolet Big Block engines (396-454 cubic inches). This camshaft features a 244/252 degree duration profile that delivers exceptional performance gains while maintaining street-friendly driveability.

Key Features:

  • Quicker valve opening profile increases engine responsiveness and maximizes area under the lift curve
  • 244/252 degree duration provides aggressive performance with solid flat tappet design
  • Engineered to boost torque and horsepower without sacrificing drivability
  • Maintains adequate vacuum for power brakes and vacuum-dependent accessories
  • Optimized for Big Block Chevrolet 396-454 engines
  • Compatible with carbureted applications

Performance Applications:

  • Best results with aftermarket intake manifolds and headers
  • Recommended with lower gear ratios and free-flowing exhaust systems
  • Ideal for street/strip and high-performance street applications

The Xtreme Energy series represents COMP Cams' commitment to modern camshaft technology, offering superior performance compared to older, slower-ramping grinds. This camshaft delivers the aggressive performance enthusiasts demand while retaining the creature comforts needed for regular street driving.

Products specifications

Advertised Intake Duration

282

Basic Operating RPM Range

2,400-6,800

Grind Number

XS282S

Lifter Type

Solid Flat Tappet

Intake Duration at .050 Inch Lift

244

Exhaust Duration at .050 inch Lift

252

Camshaft Material

Nitrided Cast Iron

Cam Type

Solid Flat Tappet

Assembly Lubricant Included

Yes

Lifters Included

No

LOBE SEPARATION

110

Valve Springs Required

Yes

California Proposition 65

WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov

C.A.R.B. E.O. Number

N/A

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. Exemption Reason

N/A

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

Advertised Exhaust Duration

290

Usage

Street/Strip

AMAZON ASIN

B002EDYPCK

Intake Valve Lift

0.59

Exhaust Valve Lift

0.598

Engine Family

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

Camshaft Series

Xtreme Energy

first time ive order from here and my experience was great! shipping was crazy fast. and they had the best price shipped on the 2jz arp head stud set i could find. also how on their site they actually list if they have the part in stock and how many which is very helpful. ive payed for parts to find out the vender didn't even have them available. which lead to more down time. and we all hate down time :)

Ordering was easy and had items in stock. Will see how fast shipping is...

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Best price on the internet. A lot cheaper than amazon, so I was pretty surprised.

This is the first time I've ordered from Autoplicity. I found they had the best price on the item I was looking for and decided to try them. I ordered this item yesterday(Sunday) and was just informed that it shipped. That is quick. I am pleased with their customer service and will use them as my first source.

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I ordered a Flowmaster cat back system for my 2012 F-150. The order arrived the day they said it would and the product came at a fair price. Well done.

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