Std Piston Markings

ram5ay

Member
Currently stripping my engine, and would appreciate a wee bit of help with some marks on the top of my std pistons.
They read down as follows:
2
ZU6
54C
05

I figured the top three are just factory stuff relating to engine as 54C is on the block too, but the bottom (05) is a lighter stamped mark, and I was wondering if it could be an oversize?
The engine has done nearly 90k miles and appears to be in good condition with no obvious wear to the bore, no lip atleast like I've seen on other engines I've pulled apart. I've not had a chance to measure anything yet so It would be handy if any of you know the exact size of a std piston.
Thanks :D
 
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