COMP Cams · New
COMP Cams Camshaft CS XE256H-10
MPN 12-234-2 · Store SKU cca12-234-2
Supplier stock checked 11/7/2026, 7:11:19 PM UTC. Adding a part does not reserve it.
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Product details
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. Camshaft Part #12-234-2 Grind #XE256H-10. Duration @ 0.006": 256 / 268deg. Duration @ 0.050": 212/ 218deg. Max Lift w/ 1.5RR: .447" / .454". Lobe Separation: 110deg. Lobe ID#'s: 5441 / 5230. 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: 411 ft/lbs @ 3600 RPM. Max Power: 330 HP @ 4700 RPM. Manifold Vacuum: 18.5" Hg @ 800 RPM & 20" Hg @ 1000 RPM w/ no load. Xtreme Energy 212/218 Hydraulic Flat Tappet 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 Xtreme Energy 212/218 Hydraulic Flat Cam for Chevrolet Small Block Strong torque thru low end and mid-range, good idle.
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
