what do you use for timing on your na sohc for performance?

[tastyratz]

ok so thats about it. Sohc base timing is 15 degrees. Dohc base timing is 20 degrees. Running several degrees advance is safe for the sohc and the dohc.... Usually ok to run a little more on any car really. These are same bottom ends (minus cooling oil squirters on dohc and knock sensor) but the dohc has higher compression. However, the dohc was tuned from the factory to run higher compression. My question is if you make power cranking the dohc to 22-23 degrees ignition advance, could you safely crank the sohc to 22-23 degrees and make more power by safely doing so? This is a 2-3 deg increase of timing for the dohc but thats a 7-8 deg advance over stock on the sohc Would that be at all a good idea?? Do you have a SOHC thats currently in an NA build state, if you do how far have you found you could safely advance your timing? atleast till it stopped making power and just cause more stress. BTW my car is daily driven on 93 octane which is alot more than the sohc was originally tuned for from the factory. (Is there a rule of thumb for octane to advace i.e. 1 pt octane is good for .7 deg advance or however)