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They are low tension rings against a low friction cylinder wall, but yes vacuum leak could cause slight loss of ring seal. Leaner air/fuel ratio from eliminating "false air" getting into intake without flowing thru the mass air sensor, is probably biggest reason for the improvement.
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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