I had a Sportmaster too. Won FH Albany to NY with it in 1965 It was very sensitive to props. John DiPetra work my Sportmaster Props (Mercury). Didn't realize Michigan had Sportmaster Props or I would had had some. MIchigans were my best stock unit props and speedmaster props. Boat was a 1964 15'2" Allsion.
Also had a 1000 Speedmaster would run 70/71 on the Speedometer on the Allison.
Still have the Speedmaster prop we set the SH record with in 1968. Boat was the above pictured Switzer.
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