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The picture in the factory parts manual was not accurate
306107 is the part number on this
1986 1987 1988 1989 1990 1991 1992 1993
225 (2 BBL
You just wouldn't use one of the tubes
MerCruiser 470 485 170hp 3.7L Heat Exchanger Cooling Hoses Set 32-77331 32-76326 steering wheel The picture in the factoryItem Details Removed from a 1976 1978 MerCruiser 470 4cyl 170hp S N 4773394 (w 3" diameter heat exchanger) (MCM) MerCruiser made researching this section extremely confusing, so if something doesn't seem right here, please let me know.. Some of the hoses had the part numbers stamped on them and others I've had to deduce which part it likely is. Most of the parts here are for Serial numbers 4487701 & Up and generally these parts were used up until 1982