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Rocker, valve clatter

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Lionheart

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Good morning all.
Our J3C A65 -We are 28hrs after a top end re-build (which included end plate off and new oil pump but not splitting the cases) one oil change at 5hrs, next one 15hrs, using W80 and landed yesterday with a distinct valve/rocker clatter noise. Not aware of it on the last day of flying which was with lots of Cub people so sure even a little noise would have been heard. We will do another oil change but interested to hear thoughts on this.
Thanks Rich
G-RAMP 1941 J3C A65
 

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