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The service manual states I should have 79B piston rings, but I have three boxes of two each #3085803 rings marked 79A. So...which one should I use? What is the difference?

I also am concerned about clearance. The jugs are perfectly cylinderical, but 0.0029" clearance on two jugs and 0.0028" on another. Service manual states minimum is 0.0027". Uhhh...daayyumm, this is tight. Too tight?

Any comments appreciateed. Thanks.
 
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