COMP Cams Camshaft Kit CS XR300HR-10

SKU: SK12-444-8 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.
Includes Cam, Lifters, & Timing Set
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.