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On 8 Nov 2005 at 21:18, Steve Jackson wrote: > Correct me if I am wrong in my thinking 'cuz I never have owned a car I > needed a timing light for, but if a circle is 360 degrees, wouldn't a 30 > degree slice equal one-twelfth of whatever circumference the pulley was? Exactamundo! Or just measure the diameter and multiply by 3.1416, then divide by 12. > Of course, one would also need to know where to start measuring from as > well! This may seem stupid to some but I really don't know...and since > my engine is in the process of installation I need to find out so I can > fire it up when it is in and wired up...