93.5 / 25.4 = ~3.6811...

Yes, I'm quite familiar with the metric system, thank you.
That's what's called a "typographical error", in which I cut and pasted data from a page containing an error without actually doing the math. The similarity should have been to the Toyota L4 DOHC “AZ” motor at 3.81888612" (97mm), the Ford is about 3.80". I'd prefer to correct the original post, but in their wisdom the moderators have decided to make all errors permanent.

and this is for a chevy straight 6...

And, to acquaint you with how a BBS work: that post was a response to the prior post, which refers to the Ford V8 - and says so (see the little "[Re: jimmy six #35]" at the top?).