vivivivivibration

Just researching here right now, trying to find a look at the back side of a neutral balance early 318/340 flywheel. Found a picture but thinking this one is exacatlly what you have with the one drill hole in it. Got to keep looking to find a factory original 318 steel crank flywheel. Will get back when I can find a reliable picture and not someone just trying to sell something that they don't know. This flywheel has a casting number of 2264598 and is a mopar part, not sure the year though. May you can look up on the engine side of your flywheel and read the cast number, or at least the last 3 digits.

340 Flywheel.jpg


Also that helicoil hole you are talking about, yes that can be part of the problem or the whole problem. They took a 5/16" threaded hole drilled it out all the way through to next size to accept the short length helicoil. They also removed more material cutting all the thread all the way through too. Supspicous of the problem here. Also am interested of where this repaired bolt hole is in relationship to the large single drilled balance hole?

That is another good spot to use your longer test bolt with the 4 stacked up washer on to help offset the material they removed. Again make sure you have clearance and see if this helps or hurts your vibration problems. It is either going to get better or get worse. The answer will help us solve this issue. Thanks