454, 1987, lower oil dipstick Bolt

[Sgt Gus]

Well that's cheap

 

[legopnuematic]

If you can get a measure on the minor diameter of the hole that would be a good start.

Now, the hole could have been altered before for some reason (say drilled larger than it should be for the given thread, but here are the minor diameters of various threads:

7/16-14 .360-.376
7/16-20 .383-.395
1/2-13 .417-.434
1/2-20 .446-.457
M12x1.75 .4016
M12x1.25 .4252
M14x2 .4724
M14x1.5 4921

A measurement would at least narrow it down to a few choices.

If you have a Lowe’s hardware or other place that sells Irwin Hansen, should be ~$7 each for a standard and metric pitch gauge set.

Made in the USA too. Irwin Hansen also makes them for Snap-On.

 

[Ricko1966]

I think I'd make a threaded bushing and call it a day. I'd start with a brass pipe reducer in closest to correct O.D. file a notch on one side to collect chips cross thread it in. The cast iron Wil cut new threads in the brass. Tap the I.D something common.

 

[Sgt Gus]

I think I'd make a threaded bushing and call it a day. I'd start with a brass pipe reducer in closest to correct O.D. file a notch on one side to collect chips cross thread it in. The cast iron Wil cut new threads in the brass. Tap the I.D something common.

Could be left off due to starter wires. See post #8. No biggie, I may mess with, I may not.