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Reply to "Dual Diaphragm (vacuum advance/retard) Distributor"

Thanks for the response Jon. I’ll need to hear from a few more car owners, hopefully someone with a lower SN# than mine. But I'm guessing only EGR equipped cars had the boss in the water neck because they added a second temperature controlled vacuum valve and there was no place else to put it. That 2nd valve is in the bottom of the picture and has just two vacuum lines.
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