I'm not sure if this can help you but check out post #7 of this thread.
https://986forum.com/forums/performance-technical-chat/79368-so-i-have-spare-engine.html
Two years later it is still fine, and no leaks with no sealant.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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