RE"N"Z piston?

[merc-blue]

G'day i have just torn down a engine and noted the pistons are maked RE"N"Z (the N is backward) on the inside of the skirts anyone got an idea on there maker?
also teh end caps are marked (in order) 1 4 4 2 whats with that?

engine is a 2TG/3T hybrid that was origionaly build by sean malony and maintained over the years by toyota twin cams

[Robbos_Toyotas]

what motor is this in?

[merc-blue]

EDITED, i posted the msg when went outside to glad wrap the block then realised

[SeptemberSquall]

EDITED, i posted the msg when went outside to glad wrap the block then realised

those numbers on the caps are designed to indicate which cap belongs to which bearing. should be 1 2 3 4 5, but if it's been rebuilt it may have been line bored, in which case the caps should have been re-marked or keyed for order somehow.