Yeah it happened to my Grandmothers wonderful pile of an XJ8, I think it was like $3k to fix.

Happened exactly a year after the crappy ZF gear box gave up the ghost.

I'd put a long block in it, the 2000 and earlier engines tend to lose compression eventually. Not worth doing the heads on one IMHO.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200