![]() The problem with ported vac is that by eliminating vacuum advance at idle and low speeds, you can cause the engine to overheat. The thermal vacuum switch is only needed if you are using ported vac for the distributor. The exact connection point of each hose is irrelevant. Any manifold vacuum port is equivalent in performance. Everything else (modulator, power brakes, HVAC controls, vac trunk, cruise control, etc) all connect to manifold vacuum. I'd run the distributor from straight manifold vacuum also. Ported vacuum is ONLY used for the distributor vac advance, and frankly that's only for emissions purposes. There are only two sources of vacuum on your motor, straight mainifold vacuum and ported vacuum. You are only confusing yourself with that late-model plumbing diagram. The car seems to shift right now, and I left some big black marks down the street lol. The purple goes straight to the ported vacuum on the carb. It seems the only thing different is I had the top and middle vacuum lines switched ( green and purple ). ![]()
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