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[JAC91]

Hello Everyone
What year and model motor?
4afe's w/ 91 + octane go w/ 2 degrees advance.(had this motor for the 1st 250,000 miles of my car)
Low-comp (blue top) 4ag's same as above!!
W/ intake,headers,2 1/4 exhaust still no pinging (what I have now)

All other 4ag's I would leave stock as they all use 91 + octane from the factory due to the higher comp.
Which makes advancing a little sketchy.
Maybe if you can get some 96 octane I would try to advance on a High-comp (red top) but that's about it.
As for silver and black tops just leave them stock or you migt have to retard them some due to the lower octane ratings here in the states.
Just my 2 cents!!
C-YA!!