did you have plastic bits in the oil pan?
Leak down test would have helped before as that will show a valve issue usually.
snap some pictures of the head, maybe it will be obvious if it's a spring.
You did lock the cams right? Both of them?
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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