12A dyno
 

We are going to the dyno with the race car, 1985 with 12A
What’s the best air/ fuel for a 12a, have been told 12 or 12.5 to one ?
what Timing should we use ?
whats to much timing ?

13.0 typically is what will work best for most setups. Timing depends on octane mostly, assuming 91 octane 25 to 26 degrees in the powerband.

It will knock when you have too much ;)