My 1987 Catalina 27 with a universal m-18 has a one inch diameter prop shaft. If you have a different engine or model year boat it could be different though.
mine is an 84 with the m-18... i would not doubt that it could be different.. But i don't think it is.. I guess i could make a run out there and measure it. In less some one else can confirm. thanks tho
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