SB2.2 NASCAR RACE CYLINDER HEADS The Chevrolet Performance SB2.2 NASCAR Racing Head was designed to help durability, simplify preparation procedures, and reduce the overall cost of building and maintaining a Small-Block Chevrolet racing engine. It is ideal for single, four-barrel carburetor applications due to having “mirror” design intake ports and all eight ports being angled toward the center of the engine. Spark plug holes were moved toward the bore center for combustion efficiency. 48cc combustion chambers permit 12.1:1-compression-ratio flat-top pistons. Aluminum SB2.2 NASCAR Race Head Technical Notes: • 355-T7 X-rayed and “hipped”* aluminum competition cylinder heads • Extra-thick decks for heavy flat milling • Extra material around ports for professional porting • Combustion chambers are very small, shallow and wedge-shaped • Precision T-washers installed in all four center head bolt bosses • Designed for longer-than-stock 2.150" and 1.625" valves • Valve spring pads accommodate 1.625" diameter springs • Modified valve angles: 11° x 4° intake and 8° x 0° exhaust • Designed for aftermarket shaft-mount rocker systems • Revised location angled spark plugs (14mm, 5/8" hex, 3⁄4" reach, gasketed plugs) • Requires specific left–and right–hand pistons • Valve cover P/N 12480006 • Replacement AN-08 intake port plugs available as P/N 12480171 Part Number Description Technical Notes 12480011 Semi-Finished SB2.2 Aluminum Cylinder Head (Discontinued) Aluminum NASCAR-accepted head; Bare head, no seats or guides installed; Standard .500" guide holes; “As-cast peanut” ports; 48cc “as-cast” combustion chamber 12480129 Semi-Finished SB2.2 Aluminum Cylinder Head (Discontinued) Aluminum NASCAR-accepted head; Bare head, no seats or guides; Reduced size .375" diameter guide holes; “As-cast peanut” ports; 48cc “as-cast” combustion chamber *HIP is the acronym for hot isostatic pressure. This process puts the heads in a sealed vessel where a vacuum is first used to remove room air and any possible contaminants. The vessel is filled with high pressure nitrogen (up to 30,000-psi) and then heated to the required temperature and sustained for a determined amount of time. The cooling process is also a controlled procedure to ensure maximum strength and proper heat treat. This extreme high pressure and heat removes almost 100% of the internal porosities that are generated during the casting process. The material integrity, strength and fatigue life increases significantly. CYLINDER HEAD GASKETS, HEAD BOLTS AND STUDS Chevrolet Performance cylinder head gaskets, cylinder head bolts and cylinder head studs are made with high-quality materials. Their superior construction helps ensure optimum sealing between cylinder heads and the engine block. Gasket packages contain one gasket unless otherwise specified. Head gaskets are available in a variety of materials and thicknesses. Use the proper gasket to maintain compression ratios and minimum piston-to-cylinder-head clearances. Part Number Description Technical Notes 10105117 Composition Head Gasket Composition head gasket with stainless steel fire ring; For stock or mildly modified engines with 4.0" cylinder bores; Fits cast-iron or aluminum heads; Used on Ram Jet 350; .028" compressed thickness 3830711 Steel Shim Head Gasket For stock and mildly modified engines with 4.0" cylinder bores; .026" compressed thickness 12732510 Steel Shim Head Gasket Stainless steel fire rings; Fits aluminum or cast-iron heads; Used on ZZ4 and 350 HO engines; .051" compressed thickness 10185054 Heavy-Duty Composition Head Gasket Teflon-coated; Pre-flattened wire O-rings around each cylinder; For competition engines with cylinder bores of 4.0" to 4.125"; .041" compressed thickness NOTE: Drill steam holes when used on 400-ci Small-Blocks. Gasket does not require re-torquing. 12499223 Cylinder Head Installation Kit – 5.7L L31 Engine Comprehensive kit; Includes 2 cylinder head gaskets, 2 valve cover gaskets, 2 intake manifold gasket sets and 2 exhaust manifold gaskets; .028" compressed thickness 14011040 Hardened Washer .450" I.D. x .778" O.D. ; Sold individually 10051155 Hardened Washer .450" I.D. x .750" O.D.; Sold individually, for Phase 6 and raised-runner aluminum heads 585927 Cylinder Head Dowel Pin Dowel pin 5⁄16" diameter by 9⁄16" long; For all Small-Block V-8 and 90° V-6 engines 12495499 Cylinder Head Bolt Kit For iron or aluminum heads, Includes 14 of P/N 10168525; 4 of P/N 10168526, 16 of P/N 10168527, and thread sealant Small-Block Cylinder Heads Additional Required Components Part Number Head Gaskets (Quantity) Bolts (Quantity) Spark Plug Engine Application 12691728 10105117 (2) OR 12557236 (2) 10168525 (14), 10168526 (4), 10168527 (16) 19354420 19434602, 19433031, 19433036, 19433030, 19433038 19417592 10105117 (2) OR 12557236 (2) 10168525 (14), 10168526 (4), 10168527 (16) 19355201 19434604 19331472 10105117 (2), 10185054 (2) 10168525 (14), 10168526 (4), 10168527 (16) N/A 157 SMALL-BLOCK COMPONENTS SB2.2 Cylinder Head (exhaust) Cylinder Head Installation Kit Heavy-Duty Composition Head Gasket Composition Head Gasket Parts intended for competition use only. See page 2 for details. Additional components required for installation. See chart above.
