I dread the annual engine compartment cleaning. Trust me, what Jim said is very true. I don't take the engine out, but the compartment cleaning would be much easier if I did. I can't wash my 03 Mach 1 engine compartment for fear of burning/shorting out one or more coils, but I wash the shit out of the 289. I use a degreaser followed by a good brushing of Dawn dish soap/water mixture then a pressure sprayer. It's work, but the old 289 stays clean for most of the year.