The accepted norm for a race engine with everything well set up is 15* at peak power.
If you cant run this due to getting into deto, then its usually due to low com and or excessive squish velocity.
If it runs fine below this , then its screaming out to be advanced.
You have plenty of com for the fuel at 16:1, and the scavenging is not too bad,so if it likes more than 15* at peak then go looking for something that itsnt optimum.
My first guess is the carbs are too small, and or the reed area isnt sufficient for the big cylinder.
All mods are aimed at increasing the dynamic com, so getting more air in there will do this and end up limiting what can be achieved with advance.
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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