An aside...I'm not sure ceramic coating would be a great idea for an engine
block.  The product I used on my exhaust (Black Satin, Techline Coatings)
claims 30%ish heat rejection.  On an engine block, that would mean a fair
amount of heat retained by the block that otherwise would be radiated into
the engine compartment.  Then one wonders as to the thermal design
tolerances.