That V10 will be 275-HP, about like the last (1996 model Chassis Year) 460's. Newer ones (2000 and later) have "Performance Improved" heads and 305-hp. I drove the 275-hp in an F250 towing a large fifth wheel, and a much newer F350 with a Bigfoot truck camper. Yes, F-series, but my points are
1. I couldn't tell much difference in how they drove and the 350 had the three-valve V10 (ALL E-Series are two-valve) between two-valve/275 and three-valve/362. So I don't think you'd ever fell the performance difference in 1997-99 with 275 and 2000+ with 305.
2. Also, it seemed to me that the 275-hp got a little better fuel mileage than either of the engines with more HP/more valves.
3. But... The 275-hp had very few threads on its spark plug threads. A number of them "spit" plugs. Not just V10's - all the "Modular" engines, like 4.6 and 5.4 V8's (and I believe also a V6) had the same issue. The three-valves have plug issues too, but they're different and the discussion's irrelevant since no E-Series gets a three-valve engine.
