It could be a lifter... you might be able to take the rockers off and remove the pushrods and look at them with a inspection camera ( can rent one from most parts stores), if not you'll have to pull the intake and valley cover and look at them..
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2010 Aqua Blue 1SS
KWC 3pc forged, Seibon hood, ZL front end, MGW, ARH full exhaust w/ Doug Thorley axle back, BTR4, Roto-fab, LSXR 102, NW 102, 3.91s
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