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Not to start an argument,
Boring a cyl normally leaves the compression pressure the same, unless the head has a squish band.
O.P. , I guess you were checking an older engine to see if it has excessive blow-by? As in wore out low compression?
Ecco driving tends to build carbon on the piston crowns. Don't worry if the comp is high as long as its not pinging due to detonation.
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