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I have a I beleive is a 1971 50 h/p merc thunderbolt could someone tell me what was the stock prop size that was put out for this motor <br />s# 3173953 50 h/p 4 cyl
Coulda been many.... heres the ones my book lists for 1970 - 1973, 40-50 hp with 13 spline shaft.. <br /><br />all have 10-3/4"dia. and pitches available from 10" thru 15"..<br /><br />What ya setting up there Bubba?
setting up that thunderbolt 500 for that little bass boat i am working on. The johnson i am going to have to overhaul this winter so i am going to run the merc. it runs sweet was just wondering about the prop.
