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Does anyone have an old Pefect Circle catalog? I came across some new piston rings in my shop that probably either go to 1940 110 or possibly a later 327. They have S 5797 STD-.01 printed on the boxes - can anyone identify them in relation to Packard? Of course, I know what STS- 01 means!

Mahle took over Perfect Circle. You might give them a call and ask them. The phone number for their USA offices is 1-800-223-9152.

Good Luck

1948-54 engines with 3-1/2'' pistons according to this eBay listing

eBay Piston rings, Perfect Circle

That's great and is exactly what I wanted to know! Since my own set is missing one and is the same oversize as those on eBay, I went ahead and bought them to complete mine. I was hoping they went to the rebuilt but still disassembled 1940 110 engine that I have which also has 3 1/2" pistons but I'll settle for them fitting a 327 that I have in similar condition.