![]() ![]() If your timing isn’t correct right off the bat, nothing else will be correct either and you’ll be chasing your tail. I don't necessarily disagree with this advice about the advance port, but when i tried it my enginge "loaded up" in heavy traffic so I switched it back.įirst of all, it’s not as easy as slapping the carb on there and cruising. You'll get quicker response and better fuel economy. Do yourself a favor and block off the ported vacuum and connect your vacuum advance to manifold vacuum. That was intended to increase exhaust temperature to burn off more hydrocarbons, but all it really accomplishes is burning excess fuel. The purpose behind it was to retard the spark at idle so the fuel/air mixture would be burning as it exited the exhaust ports. ![]() Make sure there's a check valve between the manifold and your brake booster.Īs for the vacuum advance - ported vacuum (Edelbrock calls it "timed vacuum") was an early component of emissions control. Vacuum boost for the brake and the vacuum modulator for the transmission should be hooked up to full manifold vacuum - usually a port in the manifold directly behind the carb. Your PCV needs to be connected to the large port in the front of the carb. ![]()
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