well done bro, thanks for your effort. During your studying of the centre seal - can you see how you might get a situation where upon reassembling the engine and leak testing, cross leakage through the centre seal happens in one direction but seals 100% in the other direction?

I've had this happen twice now and after running the engine for maybe half an hour it just cures itself and seals 100% in both directions. Like something seats itself properly and the problem dissapears. Weird i know.

Hope my description makes sense! Just wondered if this rang any bells with anyone else?
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