For the early Dodge models that do not have an access panel in the passenger front fender to get to the valves there is only one way to comfortably adjust the valves. I was able to completely remove all the manifolds and get enormous access to the valves in less than 30 minutes. As far as I'm concerned, there's no more mystery, valves were adjusted in the early models by removing everything in the way. It took me less than 2 1/2 hours to access the valves, fully adjust them using this Speedy Gui