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I've got a 460 in a 1987 E350 based RV -- just checked the front plugs, and oh my goodness.
I can SEE the one on the driver's side, but I can't figure any possible way to get a wrench on it -- not from underneath either. On the other side it looks like I have to remove TWO air pumps ( I think that's what they are )
I'm hoping that I can get the others by pulling the doghouse, but I'd really appreciate any advice on the front ones.