Freeze Plug Diameter

[1972RedNeck]

What's the diameter of the freeze plugs on these engines? I find some listed for 1.75" and some 1.735"...

[sclor]

I looked up on rockauto.com. I think the 1.75" is correct. I saw 1.75" as the minimum and 1.7635 as the maximum. Looks like they are a bit cone shaped so they tighten as they go in.

Hope that helps.
Regards
Steve
New Orleans