I have an 86 NA S4 motor in a 93 B2200, running the stock N326 ECU and electronics. I checked my ignition timing the other day for the first time, and it was advanced probably 40 degrees according to the marks on the front pulley, retarding the ignition as much as I can on the CAS brings me to about 10 degrees advance (which I think is 5 degrees BTDC actual timing). I was checking the front leading plug timing, engine was at operating temperature, and idle speed was 800RPM.

I also checked to make sure the CAS was installed properly, and it was. I also checked the trailing timing, and it is firing at the same time as the leading plug.

Anybody heard of this before?

Here are some pictures of my front pulley showing the timing (using a timing mark and no flash on camera):

Here is what the timing was set to originally (CAS is in the middle of adjustment), I marked the 3 timing marks to make is easier to see:


This is with the CAS at full retard: