What size motor are you running. If you’re running a 225 then I would say yes on the 24 pitch but if you’re running a 250 on a 20 foot boat then yeah I would stick with a 25 if you’re running a 225 then I would say yes on the 24 patch but if you’re running a 250 on a 20 foot boat then yeah I would stick with a 25 pitch And like I said send it to Mark for his magic touch an extra set of vent holes