I have a 1990 Stingray 20' with a 350 Magnum. Prior owner had a 14.5x21 SS prop and when I bought the boat it went 63 MPH WOT at 4600 RPM. The boat ran this way for one year, but then I destroyed 5 intake valves because the engine had way too much advance.<br /><br />After a head job and...
I have a 1990 Stinray with a 350 Magnum and it is bogging down at WOT. It will reach peak RPM's, but after 15-20 seconds it starts to lose RPM's without missing. If the engine is run at other throttle positions it runs good, up to WOT. It is also having problems starting, the starter engages...
