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Chevrolet Performance 88958667

R0X SB2.2 NASCAR Aluminum Cylinder Head

Chevrolet Performance 88958667

809-88958667

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Estimated ship date 09/29/17 if Ordered Today
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Chevrolet Performance 88958667 R0X SB2.2 NASCAR Aluminum Cylinder Head $1,721.26
R0X SB2.2 NASCAR Aluminum Cylinder Head
  • Fully CNC-machined aluminum race head with cast ports and combustion chambers for professional finishing

  • Chevrolet Performance 88958667 Details

    R0X 4.500" Bore Spacing

    Notes:
  • Machined for 4.500" bore center R0X cylinder block - 809-25534453
  • Fully CNC-machined aluminum race head
  • Has cast ports and combustion chambers for professional finishing
  • Special spread head-bolt pattern, 3/8'' fasteners, 19 holes
  • Machined with additional .070'' material on deck face
  • Valve centerlines moved apart .100'' for additional valve clearance and larger valves
  • Valve angles are 11° x 4° intake, and 7° x 2° exhaust
  • Exhaust port positions are slightly reoriented, but same bolt pattern as standard SB2.2
  • ''As-cast peanut'' intake ports
  • ''As-cast peanut'' exhaust ports
  • 28cc ''as-cast'' combustion chambers

  • Specifications:

    Manufacturer's Part Number:
    88958667

    Chevrolet Performance SB2.2 NASCAR Aluminum Cylinder Heads improve durability, simplify preparation, and lower the cost of building/maintaining a competitive small block race engine. "Mirror" intake ports are all angled toward the center of the engine, making these heads perfect for single 4-barrel applications. The spark plug holes were moved for greater combustion efficiency, and 48cc chambers can produce 12.1:1 compression with standard flat-top pistons.

    Features
  • Sold individually
  • HIP-treated* aluminum heads
  • Extra-thick deck for heavy flat milling
  • Extra port material for custom porting
  • Intake/Exhaust Ports: "As-Cast" Peanut
  • Valve spring pads accommodate 1.625" springs
  • T-washers installed in all four center head bolt bosses
  • Replacement -8AN intake port plugs available #809-12480171
  • Revised spark plug location for angled 14mm, 5/8" hex, 3/4" reach, gasket seat plugs
  • Designed for longer-than-stock 2.150"/1.625" valves and aftermarket shaft-mounted rocker arms
  • 4.400" Bore Spacing: 48cc "As-Cast" Combustion Chambers and 11° x 4° Intake, 8° x 0° Exhaust Valve Angles
  • 4.500" Bore Spacing: 28cc "As-Cast" Combustion Chambers and 11° x 4° Intake, 7° x 2° Exhaust Valve Angles

    Requirements
  • Specific left-hand and right-hand pistons
  • Valve Covers #809-12480006 or #809-12480012

  • *HIP stands for Hot Isostatic Pressure. This process puts cylinder heads in a sealed vessel where a vacuum removes room air and any contaminants. The vessel is filled with high-pressure nitrogen (up to 30,000 psi) and then heated to and sustained at the required temperature for a preset length of time. Cooling is also controlled to ensure maximum strength and proper heat treatment. The extreme pressure and heat removes almost 100% of the internal porosities generated during casting. The material integrity, strength, and fatigue life improve significantly.

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