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Normally you shoot for the maximum advance for the car/engine combo (presumably what's marked on your pulley, if stock) and let the fixed advance fall where it will. Assuming you can't change the distributor's curve
Andrew
 

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Premium Member
71 Berlina 74 GTV 17 Giulia Q4
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6,596 Posts
advance until it starts pinging, knocking, making ratteling sounds then back off until it goes away. That is generally 36 or 37 degrees which is a tad past the M mark on the pulley. basically what Andrew said or just set it at the "M" mark with the engine running around 3000rpm. Someone correct me if I'm wrong on the 3k, going on memory. if you look at all the curves for all the distributors max advance is reached around there.

There is an excel spreadsheet on the forum somewhere giving all the curves for all the distributors, most all anyway, used on Alfas. Your distributor is probably listed on it.
 
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