Standard Twin Cam Case Spigot Bore

[Ohio HD]

Yeah, me always asking for some measurements. I don't have a standard Twin Cam case to measure here, I have two cases opened up but both are for 4.125" bore.

Can someone measure the cylinder spigot bore in the case for an 88", 96" or 103" motor? I'm looking for the main bore dimension, not the o-ring relief.

I know that a 110" uses a 4.205" bore, and I'm guessing the standard case is around 4.080" ~ 4.090", but I would like to be certain.

Thanks

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[SP33DY]

A 103 case I have here measures 4.082" with Starrett Snap Gauge and Starrett mic.

[Ohio HD]

Perfect, thank you.

[JSD]

The above would apply to 88 & 96 cases