Semi-Finished SB2.2 Aluminum Cylinder Head - .500" Guide Holes

• Aluminum NASCAR-accepted head
• Bare head, no seats or guides installed
• Standard .500" guide holes
• “As-cast peanut” ports
• 48cc “as-cast” combustion chamber

Aluminum SB2.2 NASCAR Race Head Technical Notes:

• 355-T7 X-rayed and “hipped”* aluminum competition cylinder heads SB2.2 Cylinder Head (exhaust)
• Modified valve angles: 11° x 4° intake and 8° x 0° exhaust
• 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
• 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

*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.