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While the last two answers likely summarize the help needed, here's a longshot just in case. Is one of the bolts bottoming out before fully sealing with intended torque. Aain, I wouldn't think that's it because that would seem to leak at both layers. Also, you'd likely notice that. And, also, if it was it could be due to uneven casting as mentioned above and may then be part of a joint solution of milling and right length bolt.
Best of luck! Brent
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