Originally Posted by opelnut10
I don't know if your thinking incorrectly, I can only speak about what has worked for me. Every Opel that I have ever owned has had the dist. locked and the advance reworked to put it in quicker on a stick shift car and slower on the automatic. My wife drove a 75 FI Manta with an automatic that was getting 22-23 MPH before the dist. modification and with no other modifications made it went to 25-27 MPG. You have to have a dist. machine and play with the springs and weights in order to achieve the right curve and you have to time the car at TDC by static timing it, with the engine off.
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Of course the '75 fuelies didn't even have vacuum advance; just vacuum retard....
-Kurt