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John, Andy, Where do you connect the vacuum guage(s)? Do you need a unisyn (sp?) to do this? Bob J From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300] Sounds good to me..19.5, almost 20 as A&G mentioned. I do the same thing, Andy…it works!! I have big 6” vacuum gauge off an old Sun test stand..you can really see what is going on. Once you do that , you realize how futile adjusting the ram mixture screws by listening etc is . The Golden screwdriver does not work. Why the needles are often “ringed” half way down the taper from thousands of adjustments. I may have mentioned before but Edelbrock needles are slightly different taper , and of heavier construction--- they fix that problem with worn needles really well . I think they contact inside the carb body at a new place. Whatever---- it fixes “the needles don’t change anything” syndrome . They fit right in. Look at your needles..if obvious wear rings around what is supposed to be a smooth taper, they turn on and off abruptly as worn part seats, , drives you crazy… From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Andy Mikonis r41hp@xxxxxxxxx [Chrysler300] I have one 1961 Chrysler Tune-Up chart - source unknown - that says all engines 19.5" at idle. That's the only place I've ever seen a number. Works for me, I tune my carbs with a vacuum gauge. Andy G issue at the printers H stories needed!
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