Don Trombley
Well-Known Member
So I have the famous high idle problem on my 440 six pack. I’ve been reading as many threads as I can find to trouble shoot, but so far no luck. My question is about the center carb vacuum ports. The top one is connected to the distributor advance and provides vacuum when the engine is rev’d. I connected it to my vacuum gauge and I believe it’s working properly. The lower one that’s connected to the outer carb diaphragms doesn’t seem to have any vacuum either at idle or at higher rpm’s. Is that right? The carb came from Holley and was listed as factory referb. The outer carbs are new from Holley. The motor is fresh from the shop and I’ve not driven the car yet