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Old 07-12-2012, 04:01 AM
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Cobalt 327

I agree totally with Cobalt 327 . His comments are the same as you would find from the engine builders here as well. The piston going up and down in a tapered bore rocks from side to side which prevents the edge of the rings sealing against the cylinder wall. That is likely the cause of your low compression. What did your engine builder say about the .009 and .006 clearance you have there. "Tapered bore." The rings will show edge contact for sure just looking at them but imo the edges of the rings running out of parallel with the cylinder walls is something you should talk to the tech dept from the supplier of your rings.
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