i put up a post but then my computer crashed and can't find it to see if anybody had anything... anyways lookin for a idi motor for my 88 crew cab need a good runner...thanks eric
they are nearly the same. the 6.9 used smaller head bolts than the 7.3 but has thicker cylinder walls so it resists cavitation. you can add head studs to the 6.9 for a couple hundred bucks.
otherwise they are nearly identical. the 7.3 is basically a bored out 6.9. all external parts interchange.
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