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I think we get spoiled with the way our new fuel injected cars idle and run in cold weather we forget how these old cars run. I have a 5.2 magnum in an old truck with an air gap intake and n cold wether that think stumbles going up a hill until the intake is warmed up.

I wouldnt think steppingup a jet size or too will foul the plugs when warmed up. maybe if I go up 5 or 10 sizes there would be a problem. With hearders there is no way for the choke to warm up. It does work somewhat but not as the factory intended

jets are all stock. carbs havent been toched in 30 years. Headers so I do not have heat going to the intake. I am sure that a cold intake has something to do with it. My dad bought the car brand new. says its did it since day one. Although I assume it has headers since then also as I have...

I ment 3 steps up in rod size not 3 step rods. anyway it lean off idle when going to half throttle. I have it on the hole to give it more squirter and I have tried heavy springs in the cups. I may try a different rod in the rear carb to just see what happens. Its been like this for a long...

I have a stock 67 hemi. it has always run a tad lean until it really warms up. I am sure headers dont help the stock jetting. I have been trying to figure out if stepping down the metering rods is or stepping up all the jets is the best move. The metering rods are only on the primary...