FWIW -

My M116 motor had two broken guides and killed the driver side head. I'm going to pick up an M117 (560) late this week so long as the top end is okay.

From seeing what damage can result, I'd recommend the upper guides every 100K. Maybe the chain too.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]