harmonic balancer bolt and washer for 225

RustyRatRod said

You haven't found one at the dealer, because they didn't use one. You can certainly add one, though.

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They did so use one. Not common, in fact I don't remember seeing one on any early slant, but, in the later part for the '70's and later, lots of trucks had them. Mostly manual trans applications and engines with the multigroove balancer.