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I'd assume that if a variance of more than 10 degrees was acceptable that MB would make an offset key available for this amount. Conversely, why would MB even make an offset key available for 10 degrees if a variance of more than 6 degrees would make the valves hit the pistons? HOW would the car get to the shop with 10 degrees stretch? I would say on these engines that over 10 degrees is the limit, and be aware that maybe it already has an offset key!
Gilly
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