I question how much engineering they really had to do becuse Ilmor makes 700hp in a very reliable marine package. before everyone starts with there are no emissions, think again because they will have atalytic convertors soon enough.
Ilmor doesn't have to be concerned with the fuel mileage, the engine codes developed by low rpm misfires, and the list goes on and on. You are comparing two entirely different animals
Do you really think they care about mpg, they have 6 gears which gives great ave. mpg.
Talk about misfires, how about decelation backfires. That marine engine is sweet in all rpm ranges. I'm just saying Ilmor did very little to take this engine to 700hp.