Too late. We torqued everything to spec, and flew it uneventfully for
half
an hour, at all throttle settings, at altitudes up to 4000 feet. No
leakage
noted, all six bars on the JPI engine analyzer looked fine, everything
sounded and ran perfectly.


The point I'm trying to make is it appears that some bolts being torqued
have been overlooked and what is the chance that the cylinder nuts & thru
bolts had been overlooked also?

Simply, You don't know until you check. It'll require 10 minutes if you
have easy access to the engine.

Cylinders may run for a while but can start working on the crankcase, break
one stud then the others follow in quick succession then the cylinder
departs the engine.
Some instances it may appear that the connecting rod broke first to cause
the damage, but actually the cylinder left first and the rod broke after.

I don't have the link handy, but Sacramento Sky Ranch website has a bunch
of information.

Good chance that is just the spine bolts and you'll make TBO.

Take care

Kent Felkins