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Discussion Starter #1
My 68 454 has a HEI distributor with the coil on the cap. That coil isnt being used though and a msd box/coil is.
Today i noticed that there is a vac advance on the distributor that has no vac line hooked up to it. Is it possible they converted this to some other sort of advance and that this is not being used? How would i figure that out?
thanks
 

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The VA has to be in there to sablise the end piont of the timing....holds it in place
The VA doesnt need to be connected to run....the VA is used to give exta advance at idle and extraadvance at cruise and light load speeds
If the intial (NO VA) is turned right up for good idle, it loads up the starter motor and over advances the cent when under heavy loads.

There are older posts that describe how to set up and what stuff does
 

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Discussion Starter #5
Thanks guys. Just read it. Makes sense. This car was being used as a race car so that explains why it wasnt hooked up.
 
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