W/the depth of the V of these boats, I believe they are better served by a large diameter prop...mine is a 15 1/4" diameter w/a 17 pitch...you should gain top end and get closer to the max rpms the manufacturer recommends
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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