Ballancing a 1973 340

nm9stheham said
You didn't "connect all of the dots" in what I said. You can:
1) find out what weight is needed on the flywheel or flexplate for a late 340 and at what angle it gets installed on the flywheel or flexplate (relative to the crank bolt pattern) and at what distance.
2) THEN you REMOVE that amount of weight at that distance at a point 180 degrees away on the flywheel. That will allow you get this to work with your existing flywheel.

Then you have money for a less expensive damper.

IMHO, you have a bad plan. How will you KNOW what amount of vibration is bad and for how long?

Ok, I see what your saying now. :)

The issue is Im using a Flywheel from an Australian Mopar that is externally balanced and has been drilled in three places for balance for a Hemi 6 engine. Would it not be next to impossible to then re-drill it to act as a Cast 340 Flywheel now by just doing what you suggest?

Ive been told by guys in Australia that have used the Hemi 6 flywheel on a Small Block this is the easiest way to go and they have done so without issue. But there is very few 340's in Oz and loads of 318's and a few 360's so maybe they had done the auto to manual conversion using an early 340 or most likley a 318?

I know nothing about any of this process and all this is new to me, hence why Im asking questions and trying to find the best solution and also a solution I can also work with. So I dont KNOW what amount of vibration is bad and what amount of vibration is acceptable. I simply have no idea and so Im asking questions here and in Australia. I assumed if the engine appeared to run smoothly then it would be acceptable. If this is not the case then I need to start looking at buying the required parts.