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"I'm in the process of rebuilding my 3.5. I ordered all Genuine GM parts, but the piston ring sets are not right. The lower compression ring is 1.5 mm. But my original ring thickness is approximately 1.2 mm. GM says their rings are correct for the application, but they certainly don't fit the piston. Has anyone run into this problem, and if so, what was your solution? Where do you find the correct size rings? Thanks for the help."

This was posted back in 2011 on CF with no replies.

Any ideas?

Thanks
 

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I ordered my rings and .02 oversized pistons from rock auto. Could try them.
 
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