[grampy]

hi there i need info on a prop my boat is a 28 ft pontoonwith a 1973 85 hp johnson. boat had io drive buti welded up a transom for ob my question is about my prop 13x13 is this the best prop for this boat do not know my rpms engine sounds greatjust wondering if this is the best. marina that sold me the prop is closed. thanks grampy

[walleyehed]

Welcome aboard!!I'd say you're close...My buddy's 28ft'r with an older 115 turns a 14X13 about 5700RPM.With no tach, we really don't have a reference, but I think you're close.