Semi-Finished SB2.2 Aluminum Cylinder Head

Semi Finished SB2.2 Aluminum Cylinder Head

P/N 12480129

– 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

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

Note: 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.