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Xtreme Energy 248/254 Hydraulic Roller Cam SK-Kit for Chevrolet Small Block

Xtreme Energy 248/254 Hydraulic Roller Cam SK-Kit for Chevrolet Small Block

Magnum 230/230 Hydraulic Roller Cam and Lifter Kit for Chevrolet Small Block

Magnum 230/230 Hydraulic Roller Cam and Lifter Kit for Chevrolet Small Block

Xtreme Energy 248/254 Hydraulic Roller Cam for Chevrolet Small Block

$522.95
Xtreme Energy™ 248/254 Retro-Fit Hydraulic Roller Cam for Chevy Small Block Pro Street/bracket racing. 10:1 Compression, good intake, headers and a 3500+ stall. Very rough idle.
Availability: In stock
SKU
12-444-8
Xtreme Energy™ 248/254 Hydraulic Roller Cam for Chevy Small Block. Very strong torque with excellent mileage and a smooth idle. Xtreme Energy Cams™ bridge the gap between Magnum street cams and race only cams. Xtreme Energy Cams™ provide increased torque, vacuum, response, and power while still providing quiet operation of the valve train and the durability required in daily driven vehicles.
 
  • For Retro-Fit (Link Bar) Hydraulic Roller Lifters; Fits '58-'021 262-400 cid Chevy Small Blocks2

  • Pro Street/bracket racing • 10:1 compression, 3500+ stall, good intake, headers • Very rough idle

  • Xtreme Energy™ cams are designed to maximize torque, acceleration and throttle response while providing excellent high RPM horsepower. A faster intake valve opening increases engine vacuum and enhances throttle response. Special intake closing ramps close the valve sooner, providing more cylinder pressure and torque without resulting in excessive valve train noise. Faster ramps achieve maximum velocity sooner, increasing the area under the lift curve and providing maximum horsepower. Smoother exhaust designs allow for a more effective purge of spent gasses from the combustion chamber to further increase horsepower. Feature CRC (Constant Radius of Curvature) technology that ensures durability with aggressive hydraulic roller designs.

  • Warning: Camshaft Optimized for use with a Melanized or Nitrided distributor gear. Not compatible with cast or steel gears without similar surface treatments. Failure to utilize the proper distributor gear will void all warranties and/or return policies.


1: Cams for '55-'57 engines can be custom ordered. Please Call or Email
for details.

2: The '87+ Chevy Small Block received provisions for roller lifters. Most '87 - '93 GM cars came with roller lifters, but most '87 - '95 trucks came with flat tappet lifters in roller lifter style blocks. If your block has '87+ OEM-style roller cam provisions but does not have roller components fitted, COMP Hyd. Roller Lifter Install Kit for '87-'90 Blocks or '91-'02 Blocks can be purchased. As well as a '87+ OE-Style COMP Hyd. Roller Cam and '87+ OE-Style COMP Roller Lifters. Pre-'87 blocks require Retro-Fit Link Bar Roller Lifters.

Xtreme Energy™

Benefits:

  • Quicker opening lobe profiles deliver increased responsiveness & more area under the lift curve
  • More vacuum allows a step up in duration for greater performance
  • Best seller; excellent all around performance in street carbureted applications

Important Considerations:

  • Work best with COMP Cams® roller rockers and matched valve springs
  • Require other performance parts (intake manifold, headers, etc.) for best performance

Dyno Results

Camshaft Part #12-444-8Grind #XR300HR-10
Duration @ 0.006":300° / 306°Duration @ 0.050":248° / 254°
Max Lift w/ 1.5RR: .562" / .580"Lobe Separation:110°
Lobe ID#'s:3318 / 3319Intake Centerline:106°
Engine Type:Chevrolet 350 Small Block
Bore:4.040"Stroke:3.480"
Displacement:356ciCompression:9.25:1
Heads:Dart Sportsman IIIntake:Edelbrock Victor Jr.
Carburetor:Holley 750 dbl. pmp.Exhaust:1 3/4" Headers
Max Torque:380 ft*lbs @ 4000 RPMMax Power:426 HP @ 6200 RPM
Manifold Vacuum:6.5" Hg @ 1000 RPM & 9" Hg @ 1200 RPM w/ no load.
More Information
UPC 036584025122
Manufacturer COMP Cams®
Emissions Code
Engine Family Chevrolet 262-400 c.i. 8 Cylinder (1958-1998)
RPM Operating Range 3200-6,200
Cam Type Hydraulic Roller
Camshaft Series Xtreme Energy
Camshaft Gear Attachment 3-Bolt
Usage Street/Performance
California Proposition 65 WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
Advertised Intake Duration 300
Advertised Exhaust Duration 306
Intake Duration at .050 Inch Lift 248
Exhaust Duration at .050 Inch Lift 254
Intake Valve Lift 0.562
Exhaust Valve Lift 0.58
Lobe Separation 110
Valve Timing Lift 0.006
Exhaust Close ATDC 39
Intake Open BTDC 44
Exhaust Open BBDC 87
Intake Close ABDC 76
Lifter Style Hydraulic Roller
Recommended Components
Component Part Number
Break-In Lube 159
Distributor Gears 12200
Valve Seals 503-16
Valve Locks 611-16
Steel Retainers 740-16
Valve Springs 987-16
Valve Springs 26986-16
Valve Locks 614-16
Steel Retainers 795-16
Timing Set 2100
Timing Set 7100
Rocker Arms 1412-16
Lifter Kit 15853-16
Push Rods 7809-16
Lifter Kit 853-16
CL-Kit Upgrade CL12-444-8
K-Kit Upgrade K12-444-8
SK-Kit Upgrade SK12-444-8