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After resolving (in my mind at least) why the 911 engine has such a tight cold exhaust valve lash spec, my next question would be why does the aluminum head ALFA twin cam have such a wide (.020") spec at the opposite end of the spectrum ? I know from experience that the similar Jaguar twin cam also has wider clearances when hot, perhaps the sodium filled exhaust valve has an effect, but I'm afraid this may be too OT for this list.
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Paul
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