How do you adjust timing on a 273?

roccodart440 said

Whoah...

Let's not forget that initial timing will change total timing and even more so with a vacum advance distributer. There si nothing wrong with that initial timing but ALWAYS check total.

My advice is to plug off that vacuum advance and just run mechanical advance. Wither way CHECK THE TOTAL

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Timing a mild 100% street car using total timing is a total waste of time. Pun intended. It is not uncommon for a street car with vacuum advance to see 60* total timing with the vacuum advance engaged. Since this occurs only at part throttle, to help clean up emissions that normally would not be burned, there is no chance of detonation. A mild street car will run best with as much initial timing as it can stand excluding detonation.