Page 153 of GM Performance Parts 2006 Catalog by GM Parts Direct

SB2.2 Cylinder Head (exhaust) C SB2.2 Cylinder Head (combustion chamber) C Semi-finished SB2.2 Design ROX Aluminum Cylinder Head (exhaust) D 151 SB2.2 NASCAR RACE HEADS The SB2 NASCAR racing head was first designed to improve durability, simplify preparation procedures, and reduce the overall cost of building and maintaining a small-block racing engine. It has mirror design intake ports and all eight ports are angled toward the center of the engine, making this a perfect choice for single four-barrel applications. Spark plug holes were moved toward the bore center for greater combustion efficiency. This head is designed for aftermarket shaft-mounted rocker arms, and valve spring pads are large enough to use 1.625" springs. The combustion chambers are 48 cc, which allow a 12.1:1 compression ratio with flat-top pistons. The head is machined for standard 1/2" valve guides. 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 Combustion chambers are very small, shallow wedge shaped Extra material around ports for professional porting Revised location angled spark plugs, (14 mm, 5/8" hex, 3/4" reach, gasketed plugs) Mirror design intake ports are angled toward center of engine for single 4-bbl carb applications Designed for 2.15" 1.625" valves, longer than stock valves required Valve Spring pads accommodate 1.625" diameter valve springs Modified valve angles, 11 x 4 intake, and 8 x 0 exhaust Requires left and right-hand pistons Precision T-washers installed in all (4) center head bolt bosses Designed for aftermarket shaft-mount rocker systems Valve cover P/N 12480006 or P/N 12480012 required Replacement AN-08 intake port plugs are available as P/N 12480171 C. 12480011 Semi-finished SB2.2 Aluminum Cylinder Head Aluminum NASCAR accepted head Bare head, no seats or guides installed Standard .500" guide holes As cast Peanut ports 48 cc as cast combustion chamber 12480129 Semi-finished SB2.2 Aluminum Cylinder Head Aluminum NASCAR accepted head Bare head, no seats or guides Reduced size .375" diameter guide holes As cast Peanut ports 48 cc as-cast combustion chamber D. 88958667 NEW Semi-finished SB2.2 Design R0X Aluminum Cylinder Head Fully CNC-machined aluminum race head Has cast ports and combustion chambers for professional finishing Machined for 4.500" bore center R0X cylinder block P/N 25534453 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 28 cc as-cast combustion chambers SB2.2 Cylinder Head (intake) C ROX SB2.2 Head (combustion chamber) D ROX SB2.2 Head (intake) D NEW NEW NEW

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