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From our experience building and racing the FA20 engines I would have to chalk this up to an assembly issue. The head gasket is very good and the actual sealing ring for the combustion area is larger than what we get with the STI engines.
Unfortunately OEM is what it is but when we build these engines we do address head gasket issues with better studs and torque specs we found to be ideal. In the past we had tested oem head bolts to be very good until they got extremely hot like what track guys see and street drivers do not.
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