[WHN]

After 60 years of running these cars I’m not sure there is a true answer to this question.

If everything were new and the timing was spot on, there is still a reason that the ability to adjust the timing to such a degree is there.

90 years later. 90 years of parts moving. A little ware here and there. More reason to be able to adjust timing.

I like to run at just the point where you can feel the car might lose power if you were to retart it more or about 9:30 (lever position) on our 1929 as of the last tune-up. On hills we are very careful not to lug the engine. Retart spark or down shift, do not lug.

Ping or knock, retart. Each car is different. Enjoy.