Simple answer is 15* at peak power , if the com and squish are done correctly for the fuel,.
You can flat line the bottom end @ 28* to where the PV starts to open or where the engine obviously starts to come onto the pipe.
Advance past peak power depends on how much overev to max useable rpm there is , usually anothe 5* , then flat line at 10*.
If you have too much overev retard , the egt will keep climbing in top gear against the aero load .
Then you have to use extra fuel to cool the top end egt , not make Hp
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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