12480153 - Splayed-valve 4.500 Bore Center Aluminum Cylinder head

• Semi-machined aluminum race head
• Great for NHRA competition with dual carburetors
• As-cast ports and combustion chambers for professional finishing
• Use mid-deck block P/N 25534429 with 4.500" main bore machining
• Special larger head-bolt pattern, 3/8" fasteners, 19 holes
• 240cc “as-cast peanut” intake ports
• 78cc “as-cast peanut” exhaust ports
• 40cc “as-cast” combustion chambers