Semi-Finished SB2.2 Aluminum Cylinder Head

Product Details

SB2.2 NASCAR RACE CYLINDER HEADS
The Chevrolet Performance SB2.2 NASCAR racing head was designed to improve 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 improved 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

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
• 48cc “as-cast” combustion chamber

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