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Chevrolet Performance 12480129

SB2.2 NASCAR Aluminum Cylinder Head Reduced .375" Guide Holes

Chevrolet Performance 12480129

809-12480129

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Ships 12/19/16 if Ordered Today
Chevrolet Performance 12480129 SB2.2 NASCAR Aluminum Cylinder Head Reduced .375" Guide Holes $2,167.66
SB2.2 NASCAR Aluminum Cylinder Head
  • Reduced .375'' Guide Holes
  • Bare (No seats or guides installed)

  • Specifications:

    Manufacturer's Part Number:
    12480129

    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

  • Items You Need
    *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.