Distributor Vacuum Advance Pots

Posted by Packard Newbie on 2020/12/1 16:08:51
In JBRPackard's Nov 13th post on timing, Snopack remarked on vacuum advance being critical to a properly running engine. I wholeheartedly agree and have a couple of questions. First off, I was lucky enough to come by a NOS distributor for my car (an Autolite IGS 4201) and, while the advance pot works, i.e. the distributor advances when suction is applied to the pot, I have to wonder if, in an advance unit of that age, would the diaphragm be hardened up and not as flexible as when new, thus giving less advance than a new one?? Second question, I found an outfit in Puyallup WA that has a remarkable list of tune-up products for the 245 6-cyl and they list a vacuum advance pot for $60 (VC-3082) https://hagensautoparts.com/packard/41-electrical/13607
I ordered it, but unfortunately they have no stock and none on the horizon. They did say if I sent my old pot in, they could have it rebuilt for the same price, so my question is: Does anyone know if there is a generic Napa-type replacement that has the same thread and movement characteristics as the OEM version or am I stuck doing the rebuild and exchange thing??
I guess if the answer to question one is, if it moves the distributor, it is working and leave it alone, then I don't have to worry about it and question 2 becomes moot. Any thoughts or advice?? P.S. I do not have the equipment or ability to test the AMOUNT of actual advance with the engine running (nor do I know how much it should be) and thus, applying suction to the vacuum advance hose is the extent of my diagnostic ability. Chris

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