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Randy Mosier Mar 23rd, 99, 6:29 PM I removed the tired 307 from my 71 and have just installed a 350. The 350 has a Q-jet (four bbl) and is otherwise stock except for a mild cam. My question is, do I connect the distributor vacuum advance to ported or manifold vacuum? I want to set it up the way a 350s were set up at the factory. Thanks Havoc Mar 23rd, 99, 6:45 PM I'm pretty sure that the vaccuum advance was connected to a little fitting on the base of the carb. My 307 and 350 both had it at the front (they were 2BBL's though). Hope this helps. ------------------ Ian McDermott Columbia University New York, NY. 1970 Chevelle SS 396 havoc@graffiti.net chevelle.dhs.org (http://chevelle.dhs.org) 70 Elky Mar 23rd, 99, 6:46 PM Connect it to the manifold vacuum soure gene c Mar 23rd, 99, 10:30 PM should be a tube at the bottom of the q-jet just left of center this is ported vaccuum hook your advance line there....... Steve S Mar 24th, 99, 6:50 AM My advice is to try both and see which one gives you the best performance/driveability. ------------------ Steve Strasemeier (70SS) Kevin Mar 24th, 99, 4:19 PM It should be hooked up to a ported (above throttle plates) source. Otherwise you're going to get vacuum advance at idle - not just mechanical. odie Mar 24th, 99, 8:52 PM Interesting to hear all these replies. I tried mine both ways & I swear (not out loud!) that it works better with manifold vacuum. I set the timing with it plugged off so as not to have the advance interfere with the timing setting. When I reconnected the vacuum, the idle picked up due to the advance, but I dialed the idle down a little & it runs great. A mechanic friend of mine said it should be on the ported, but I'm happy with it as is. | ||