I'm running C&A Duramoly rings in a 383. The instructions suggest .0068" for every inch of bore in nitrous applications for a total top ring gap of .0274".

Right out of the box, the rings were already between .024" and .026". I found this very strange, but since I was shooting for .0274", I thought what the hey.

But now the second rings are WAY too big out of the box. C&A
recommends .0048" for every inch of bore, for a grand total of .0193. Before I even put the rings on a file, all of them have .028-.030" of gap already? WTF? This is a good .010 more than specified.

There are only two possible scenarios I can think of.

One, the rings are mispacked. Maybe these are for 4" bore instead of a 4.030" bore?

Two, maybe this Sears made-in-China feeler gauge is off?

Granted I'm not using a ring squaring tool, using the "upside-down" piston technique, I've been using great caution to make sure the rings sit squarely in the bore about 1" down.

I'd assume second rings that are .010 too big would mean a good deal of cylinder pressure loss and lots of oil consumption?

Advice? Suggestions?

 

Yeah ..... .028-.030 is deffenntly a little big for the 2nd ring. Also, I belive the top ring should be the smaller gap of the 2 compression rings. The stock specs are.010- .016 top and.018- .026 2nd ring. I know your not stock but you get the ideal. I belive mine are set at .020 top and .024 2nd .