MerCruiser 1623-8266-S 1623-5356A4 Pre-Alpha Lower Unit Gearcase Housing 1970-82 Blowers & Vents (more important for engines with

(more important for engines with tubes that had brass blocks & Metric (M12) Banjo Bolts on the engine for sucking the oil)

which would be Models 3012 & 3013 It may possibly fit some subsequent years

625" outside diameter

5L engine and the casting number is the same or equivalent

MerCruiser 1623-8266-S 1623-5356A4 Pre-Alpha Lower Unit Gearcase Housing 1970-82 Blowers & Vents (more important for engines withPart Numbers Included Stamped Part number is 1623 8266 S which is just the updated version of 1623 5412 that has the flat edges found on the horizontal stabilizer found on the 1982 models General related part number found in manual is 1623 5356A4 (MC I & R empty housing) and also slightly related is 1623 4110A6 (Whole assembly) Item Details Overall good condition, some damage to the skeg, but ready for all of your internals. Races are still installed