53 Nash Ambassador custom 252 cid

[Guest Karm13]

Hello all I am new to the forum!

I have a 53 nash ambassador custom 

252 iron head 2 x 1 bbr carbs

It's leaking coolant from multiple places 

Around the head gasket. But runs!

I wanted to replace rod bearings 

And piston rings for it. While cylinder head is off. The engine has been rebuilt at least ounce before. 

My question is when I measured the cylinder bores they were all 3.55 the standard bore size for this application is 3.50 and oversize rings come 0.2 0.3 0.60 the oil control rings are worn as well

So they warrant replacement also, with little or no lip at the top

Has any one seen this before. 

Is it ever permissible to install 3.60 rings into a 3.55 cylinder bore? Or is it necessary to rebate the block?