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Production design used on the SP502/600 crate engine; Fully machined and assembled; Use with minimum bore of 4.47"; 290cc intake port; 110cc exhaust port; 114cc combustion chamber; 2.250"/1.880" stainless steel valves with 11/32" stem OD; Beehive-type valve springs with 1.307" O.D. (large end) designed for hydraulic roller camshaft; Recommended head gasket P/N 12363411; Recommended bolt kit P/N 12367779
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