Virginia inspection boys are going to be unhappy with that swap.....most of the state is run by environazi's.....not sure the weight of the 4.2 V-8 but I am 98% certain the older vintage engine (the newest OM617 is a 1985) is going to be counted as a big No-No by the authorities. I would recomend getting something in writing by them stating it is allowed before you embark on this and you make something you can't register.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche