Thanks for the commentx.
The engine is a O360-A4M - not sure if we have chrome cylinders.
The three months - it seemd that nothing has been done over the past three months, normally prior to being entrusted to the shop it did fly 10-20 hours per month - my query was with airplanes sitting on the ground for three months.
When the guy revealed that it had not been run for the past three months and got my reaction he did not say he'd sprayed inhibitor, turned the prop regularly or anything else - so sitting in Florida, I am worried.I mentioned the not in a hangar simply to head off questions as to whether it was hangared amd whether it was climate controlled.
Seems I am going to have the cylinders borascoped and hope for the best - my concern is that I don't want to find that the engine eats itself 100 miles south on Antigua. Prior to this debacle I had flow the plane with confidence thousands of miles over open ocean, hundreds of miles from land with no viable SAR service - but this guy's general incompetence and poor service does not inspire confidence.
ps. The previous A&P died in mysterious circumsmtances following waking up in a hangar on Bequia with broken bones etc and no memory of what happened - turned out he had internal injuries to which led to his passing a couple of months later. Hence the need to fly it to the US for annual and its refurb.