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COMP Cams Camshaft CS XS274S-10

SKU: CCA12-677-4

Camshafts

CCA Camshafts...

COMP Cams Camshaft CS XS274S-10

SKU: CCA12-677-4

Camshafts

CCA Camshafts...

A$693.77
Available from MFR. In stock at 2 locations (10 available)

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Description

Camshaft - Xtreme Energy - Mechanical Flat Tappet - Lift 0.501 / 0.510 in - Duration 274 / 280 - 110 LSA - 2000 / 6400 RPM - Small Block Chevy - Each

XE 236/242 SFT SBC

Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts, the Xtreme Energy grind family offers gains in torque and horsepower while still delivering adequate vacuum for power brakes and other vacuum dependent accessories. Xtreme Energy camshafts work great in carbureted applications, but offer the best performance with aftermarket intake manifolds, lower gear ratios, headers and free flowing exhaust.

Additional Information

Very strong mid-range torque and throttle response, 2200+ stall.

Application Summary

Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305's and 350's from the mid 80's forward. Camaros/Firebirds/Corvettes received the roller cams early, but many trucks and SUV's had flat tappet cams until the mid 90's. Remove the intake or timing cover to confirm whether the block is a factory roller or flat tappet. Does not fit the LS1, LS2, LS3 or any LS-based 4.8, 5.3, 5.7, 6.0 and 6.2. 1955-1957 Chevrolet 265 engines require a groove on the 5th cam journal for oiling. Contact us for more information.

Part Type

Engine Camshaft

Product Overview

Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305's and 350's from the mid 80's forward. Camaros/Firebirds/Corvettes received the roller cams early, but many trucks and SUV's had flat tappet cams until the mid 90's. Remove the intake or timing cover to confirm whether the block is a factory roller or flat tappet. Does not fit the LS1, LS2, LS3 or any LS-based 4.8, 5.3, 5.7, 6.0 and 6.2. 1955-1957 Chevrolet 265 engines require a groove on the 5th cam journal for oiling. Contact us for more information.

Additional Application Notes
• Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• w/ L Engine VIN; w/ K Engine VIN;
• w/ L Engine VIN; w/ K Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• w/ H Engine VIN;
• w/ V Engine VIN;
• w/ H Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• w/ V Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• From 1985-1998 Chevrolet introduced the factory roller Small Block into GM cars and trucks. Verify whether or not your vehicle came with a factory roller camshaft. If your vehicle was equipped with a roller camshaft, look to our camshafts and kits that start with "08-".
• w/ J Engine VIN;
• w/ J Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• w/ T Engine VIN;
• w/ T Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• w/ K Engine VIN; w/ J Engine VIN;
• w/ K Engine VIN;
• w/ K Engine VIN; w/ J Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• w/ K Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• w/ X Engine VIN;
• w/ X Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• w/ R Engine VIN;
• w/ R Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• w/ Y Engine VIN; w/ V Engine VIN;
• w/ Y Engine VIN; w/ V Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;
• w/ Y Engine VIN;
• w/ Y Engine VIN; Not Legal For Sale Or Use On Pollution-Controlled Motor Vehicle Mech. Flat Tappet; 2000-6400rpm; Adv. Dur. 274 Int./280 Exh.; Valve Lift .501 Int./.510 Exh.; Lobe Angle 110 deg.;

These additional application notes are supplied by the manufacturer and collated from multiple year ranges. Not all of these notes may apply to every year or every variant. Please contact a StreetFX agent for clarification if required.

Data: v4.2 - Upd: 2026-11-09 00:35:37

Features

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Product Details

Advertised Exhaust Duration:280
Advertised Intake Duration:274
Amazon ASIN:B001NN90FO
Assembly Lubricant Included:Yes
Basic Operating RPM Range:2,000-6,400
C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?:Yes, but must meet tailpipe emission standards for year of vehicle.
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.
Cam Type:Solid Flat Tappet
Cam and Lifter Kit Upgrade:CL12-677-4
Camshaft Gear Attachment:3-Bolt
Camshaft Material:Cast Iron
Camshaft Series:Xtreme Energy
Description:Xtreme Energy 236/242 Solid Flat Cam for Chevrolet Small Block
Engine Family:Chevrolet 262-400 c.i. 8 Cylinder (1958-1998)
Exhaust Duration @ .050 in.:242
Exhaust Duration at .050 inch Lift:242
Exhaust Duration:280
Exhaust Valve Lift(in):0.51
Exhaust Valve Lift:0.51
Grind Number:XS274S
Intake Duration @ .050 in.:236
Intake Duration at .050 Inch Lift:236
Intake Duration:274
Intake Valve Lift(in):0.501
Intake Valve Lift:0.501
K-Kit Upgrade:K12-677-4
Lifter Type:Solid Flat Tappet
Lifters Included:No
Part Number:cca12-677-4
RPM Range:2000-9000
SK-Kit Upgrade:SK12-677-4
Title:Xtreme Energy 236/242 Solid Flat Cam for Chevrolet Small Block
Usage:Street/Performance
Valve Springs Required:Yes

Product Downloads

# Document Type Download
1. Catalog

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Data: v2 - Desc: v4.2 - Upd: 2026-11-07 19:01:14

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Comp Cams, Comp Cams (edelbrock)
StreetFX SKU cca12-677-4
SFX Item ID 4118797
Accounting SKU cca-12-677-4
Manufacturer SKU 12-677-4
Manufacturer UPC 036584070252
Alternative References 12-677-4, CCA-12-677-4, COM12-677-4

Camshaft, Mechanical Flat Tappet, Advertised Duration 274/280, Lift .501/.510, Chevy, Small Block, Each

COMP Cams Xtreme Energy camshafts employ the latest cam technology to provide maximum performance. Whether your use is off-roading, towing, or street performance, there's an Xtreme Energy cam available for you. By using an aggressive lobe profile, these cams provide better throttle response and more top-end horsepower than equivalent cams from other manufacturers—while delivering increased engine vacuum. Hundreds of models are available for fitment on vehicles from 1955 to the present. Select the cam designed for your application.

Product Attributes
BrandCOMP Cams
Manufacturer's Part Number12-677-4
Part TypeCamshafts
Product LineCOMP Cams Xtreme Energy Camshafts
UPC036584070252
Cam StyleSolid flat tappet
Camshaft UseStreet/Strip
Basic Operating RPM Range2,000-6,400
Intake Duration at 050 inch Lift236
Exhaust Duration at 050 inch Lift242
Duration at 050 inch Lift236 int./242 exh.
Advertised Intake Duration274
Advertised Exhaust Duration280
Advertised Duration274 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio0.501 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio0.510 in.
Valve Lift with Factory Rocker Arm Ratio0.501 int./0.510 exh.
Intake Valve Lash0.016 in.
Exhaust Valve Lash0.016 in.
RemanufacturedNo
Computer-Controlled CompatibleNo
Grind NumberCS XS274S-10
Valve Springs RequiredYes
QuantitySold individually.

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