I used to tow my 7000 lb sailboat with a 351H.O., and c-6 trans at 70 MPH with no problems. But I had to get rid of it, because everything underneath was rusting out.
I'm looking for a used E-150 van, 2000 or newer, with a 5.4 to tow the sailboat to florida this winter. But I have heard of the 5.4 blowing plugs, and having head gasket problems. Is this a major problem, or just a few engines. What years would be more reliable, between 1998, and 2003. I try to avoid a new engine, the first few production years.
I currently have a 95, E-150, with a 302, but it doesn't have the power to pull the sailboat. I miss my 351!