MerCruiser 74009 74009A6 Thermostat Housing 1976-1982 470 3.7L Exhaust Manifold Bolt Set this accommodates the Flat edge

this accommodates the Flat edge on the propeller shafts so this likely needs to still be used with early style MerCruiser Propellers

48-58426-23 / 48-58426A1 / 48-58426A4

the 1980's

Has Trim and Tilt

MerCruiser 74009 74009A6 Thermostat Housing 1976-1982 470 3.7L Exhaust Manifold Bolt Set this accommodates the Flat edgeItem Details MerCruiser 74009 74009A6 Thermostat Housing (for 1976 1982 Log Style Exhaust Manifold Assembly) Superseded to 41801T Overall Good Condition, a really clean unit with no cracks or welds Compatibility These would have been found only with 1976 1982 on MerCruiser 3. 7L 4cyl 170hp "470" models that used the 71527 Log Style manifold and generally a 3" Heat exchanger 1976 1977 1978 1979 1980 1981 1982 Alpha One 470 4 cyl 170hp 190hp 3. 7L 3.