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This is a BRAND NEW marine cylinder head for all 3.0L/181 marine engines made from 1991-newer. This is an aftermarket replacement cylinder head for Mercruiser, Volvo Penta, OMC, and GM marine 3.0L engines used between the years 1991-newer. This cylinder head has the smaller HO exhaust ports unlike the older pre-1991 cylinder heads. You can use this head to replace the older heads, however, an adapter kit will be required. Specifications: Complete with valves and springs Replaces casting #'s: 744, 620 Direct replacement for 3.0L marine engines years 1991-newer