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The starting point for our head assembly is an RHS small-block Pro Action 23-degree cylinder head, part no. 12053. It features 180cc intake runners, 74cc exhaust ports, 64cc combustion chambers, angled plugs, 1.550-inch spring pocket diameter, hardened valve seats, premium manganese bronze valve guides, and is set up for 2.02-/1.60-inch valves. This head also has an improved water jacket design for increased cooling and heat dissipation.