Big Block Tunnel Ram 660s Questions

mbaird said

if you are using a stock distributor try adjusting the VA can so that it starts at a point higher than your idle vacuum.
As it sits it may be advancing at idle.

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As stated above, I am using a MSD pro billet ready to run. 18⁰ at idle and 38⁰ all in about 2000, 2300 IIRC. I am using vacuum advance and due to the 660 no having ported vacuum available, it is hooked to manifold vacuum. I am sure it is pulling advance at idle, idle speed increases when hooking it back up.