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230 Explorer Prop

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Just bought a 97' 230 explorer with a 5.0L Alpha one and the prop that came on it was an aluminum 4 blade that I cannot read the diameter or pitch on. The owners manual says WOT is between 4200-4600 but unless my tach is defective I cannot get over 3000rpm. I put a SS 19p prop on it and gained about 5mph (40 mph top speed) but still didn't get over 3000rpm... I know I'd gain 200-300 rpm for each degree of pitch I lose but to get to 4400 WOT I'd need like a 15p prop...


Does anyone know the size of the prop that would have come on this boat? What kind of problems does running a lower RPM do to the engine???


Thanks :)

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