1966 slant six 170 timing mark

RustyRatRod said

Nine times out of ten, Chrysler didn't use crank bolts on slant sixes. A few had them, but the vast majority did not. However, all the cranks are drilled and tapped, so you can clean the threads out and add a bolt. Makes it easier to turn the engine. 3/4" x 16 by about 2" with a thick flat washer should do it. Blue locktite and torque to about 60 LB FT.

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I have been told that truck slant engines got the balancer bolt, others maybe not so much. I have two truck slants, both have the bolt. The only suggestion I'd add if you decide you want one, it get that bolt and washer in grade 8. I used a grade 5 in one case and even with a thick grade 5 washer, I dished the washer pretty bad cranking it down. The grade 8 washer will take all you can give it and still be laughing.