Quote:
Originally Posted by hawkwing
Yes it seems so. Of the 5 that were in, only 2 worked. Interestingly, there were two different models of Autolite's in there, a seemingly older style (guessing based on wear) that has a larger gap at the wiring thread and a flat heating element, and a newer style with a tapered heating element. The two older ones worked, the three younger one didn't.
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You are lucky the autolites burned out on you instead of continue to work, where the tips erode with time and eventually falls off. In open pre chambers, the dropped tip fall into the combustion chamber and destroys the head and piston. The 617 has closed pre chambers with small drilled holes and a dropped tip will not fall into the combustion chamber but will bounce around an wreck the pre chamber.