Chief rods

Here's afew nominal specs: female rod width = 1.625"; Bore = 1.500"; center to center = 8.125"

I tried to average several sets, but I imagine these nominal measurements approximate the blueprints.

What did you mean by >and how large is the small end outside?<

The wristpin bushing OD? (I have to get back to the shop to mic one.

Bore center to the tallest point is about .665"
If you have .030' clearance, I wouldn't worry about it; that gap would be a tremondouw insulation from the combustion heat.