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Production design used on the SP502/600 crate engine; Fully machined, ready for assembly; Use with minimum bore of 4.470"; 290cc intake port; 110cc exhaust port; 114cc combustion chamber; Machined for 2.250"/1.880" valves with 11/32" stem OD; Recommended head gasket P/N 12363411; Recommended bolt kit P/N 12367779
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