Originally Posted by
steveo
there are a ton of factors that affect optimal and maximum timing advance, the design of the cylinder head can be more important than the cam.
i'd start with a spark table designed for similar cylinder heads and fine tune from there.
spark advance is a lot of trial and error
when you modify an engine, the knock filter can start detecting quite a bit of 'knock' where it doesn't exist. i would remove a bunch of timing to see if the knock retard goes away, just to prove it's real knock caused by spark advance.
i would leave your distributor set to whatever your bin thinks the base timing is
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