I am new to the I/O scene and am not too sure if this is right. I just bought a 24' Baja with a 454mag in it and I am only turning 4000rpms. Motor is all stock, no mods. I have had a few people say that it could be my prop, which is a Quicksilver Mirage counter 23P prop. For some reason I don't think it would be my prop causing me to only run @ 4000RPM's WOT. I had a 454 in an older jet that would run @ 5500-6000 rpms all day and that was a stock build motor as well. Any ideas on what it could be? Could it be my prop? I have checked for vacuum leaks and there aren't any. There is a vacuum port coming off of my dizzy that does not have a vacuum line hooked up to it, may that be it? If it is, where would the vacuum line go to? The carb? Any advise on where to start or any ideas would be greatly appreciated!!