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Lower Gearcase Assembly 1643-7406A31 (Housing Stamped 1643-6458) Functionally Equivalent to the Following Numbers: 1643-9539A3
It appears to be either chrome or stainless
Strong Nylon Plastic Construction
Michigan Wheel SMC-382-C / 031039
GM 331184 MerCruiser 937-4287 937-3040 Cylinder Head 165hp 6cyl 4.1L 1970-1978 Intake Manifolds Lower Gearcase Assembly 1643-7406A31 (HousingPart Number(s) Included MerCruiser 937 4287<937 3040 Cylinder Head Assembly GM 331184 (Casting Number) 72. 76 CC (Chamber Volume) General Application Compatibility Based on the casting number it is a head from the 1973 1979 time period. Other Details Freshwater Used Parts Checked for cracks (magnaflux) and straightness with a machinists straight edge May need to be gone through before installation (valve job) but is quite clean otherwise. Purchase
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