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Chevrolet Performance Splayed-Valve Aluminum Race Cylinder Heads are extremely aggressive, all-out competition heads and not intended for street use. Splayed valves point both intake and exhaust valves at the center of the cylinder bore. As the valves open, they move away from the edges of the bore. That allows maximum-size valves to be installed without increasing bore size. The result is dramatically increased airflow, compared to inlinevalve- design cylinder heads.
The castings have a 0.240-inch minimum port wall thickness, which leaves ample room for extensive custom porting. Intake valves are angled 16-degrees to the deck surface and splayed 4-degrees. Exhaust valve angles are 11-degrees with a 4-degree splay. Making more than 1,000 naturally aspirated horsepower with these cylinder heads is easily achievable.
Splayed-Valve Aluminum Cylinder Head
• Semi-machined aluminum race head
• 240cc “as-cast” intake ports
• 78cc “as-cast” exhaust ports
• 45cc “as-cast” combustion chambers
• Same casting as P/N 12480146