I have a 21 cal craft with a short stroke Nova. I am having trouble with the header gasket buring out in one or two runs. I know the problem is that the header is tucked inside the hull and it is not getting suffecent air across it to cool the header. Is their a water cool header out there for a 21 Nova? Also, is there any other fix?? Maybe I should just get a cmb with rear exhaust.