@Cudafever - I don’t know about side coatings after purchase, but the crown can be done after all the mods are made and done easy enough. I suppose you could ether do it yourself or have it done by a piston company or coating service.
Also the head chamber and valves can also be coated.
IDK about the intake ports of the intake manifold and cylinder head and if it is worthwhile or if it has shown in the past to make power.
Interesting thought.
@RAMM - Would Eagle do it if asked?