Not Ranked
Hugh? Same time you replace the timing chain... It shouldn't need it. If you NEED to do it you likely have lifters that need replacement.
If on the other hand you are single and need a good manly excercise to impress your babe dujour do it as needed. 
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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