4539732 is the serial number on my bracket.Here is the description for it
"This is a brand new, never installed, original complete Mercury powerhead assembly for any 1973-1979 in-line 6 115HP outboard. Mercury part number 7401A2. Markings on the engine indicate a manufacturing date of June 1989. It is a factory all new powerhead from the Mercury manufacturing facility in Fond du Lac, complete with crank and pistons, not re-manufactured, not rebuilt. Block casting number is 852-7738
I obtained it from one of Mercury's largest dealerships, who ordered it for one of their jobs, only to have the customer back out of the powerhead replacement. I purchased it as a spare for one of my engines about 10 years ago, which I now no longer own. It has been stored indoors, in a climate controlled environment, and has been kept well lubricated, and rotates freely.
This is NOT a "Power Ported Piston" powerhead as used in the 140 and 150 HP models, 1973-1979, and is for a distributor ignition model only. It is not applicable to a 1981-1988 ADI (alternator driven ignition) 90 or 115 HP model. But it could be one of the only remaining brand new factory 115 HP in-line 6 powerheads from the 1970's in existence!"
