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Re: 250 HEI Timing, vacuum advance question
WELCOME!!!
Did you disconnect the vac advance when you timed it?It needs to be disconnected and plugged.
Did you check for full 12 volts at the dist.Even though you followed "shifty"'s very good instructions,you may have corrosion reducing voltage.
Did you use dielectric grease and tighten the firewall plug well?
My manual shows TDC at idle on a manual trans and * BTDC with an auto.
These are just the first things I thought of off the top of my head.
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