Re: advance curves
You can bend the thinner of the two springs on the weights to slow the curve, just be careful as they can break easily. Usually I am trying to to the opposite. On the early distributors I bend the springs outward to allow a fast curve to mimic the actions of a 11A unit.
I have never had a flathead with spark knock. Are you 100% certain your timing isn't too far advanced?? Like hoop says I have owned KRW fixtures that were off. It sounds like you may very well be too advanced, as not only does the 68 have a slower curve it advances 6-8 degrees (crank) less than the 11A.
This was Ford's idea for the vacuum brake. You can adjust it inward or install a stiffer spring to drastically slow it down, however I only apply the slightest amount of tension on the brake as in my opinion in todays fuels its not needed. I believe Bubba runs either zero or slight tension as well??
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