COMP Cams · New
COMP Cams Camshaft CS XR258HR-10
MPN 12-408-8 · Store SKU cca12-408-8
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Product details
Xtreme Energy 206/212 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. 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 Camshaft Part #12-408-8 Grind #XR258HR-10 Duration @ 0.006": 258 / 264deg. Duration @ 0.050": 206 / 212deg Max Lift w/ 1.5RR: .480" / .487" Lobe Separation: 110deg. Lobe ID#'s: 3311 / 3312 Intake Centerline: 106deg. Engine Type: Chevrolet 350 Small Block Bore: 4.040" Stroke: 3.480" Displacement: 356ci. Compression: 9.25:1 Heads: Dart S/R. Intake: Edelbrock Performer. Carburetor: Holley #3310 Vac. Sec.Exhaust: 1 5/8" Headers. Max Torque: 413 ft/lbs @ 3700 RPM. Max Power: 325 HP @ 4400 RPM. Manifold Vacuum: 17" Hg @ 800 RPM & 18" Hg @ 1000 RPM w/ no load. excellent all around performance in street carbureted applications. Important Considerations: Works best with COMP Cams roller rockers and matched valve springs. Requires other performance parts (intake manifold, headers, etc.) for best performance. Xtreme Energy 206/212 Hydraulic Roller Cam for Chevrolet Small Block Strong torque, good mileage, stock to mildly modified combinations.
Manufacturer fitment & guides
- 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.
- Manufacturer-supplied application summary from Turn14; this may not be an exhaustive fitment list.
Part-specific notes
- Not CARB approved. Destination and intended-use restrictions must be checked before sale.
- Emissions acknowledgement required before purchase.
- California Proposition 65: Y
