360 engine vibration

Yes I known what you mean, however who's to says the JEGS part is US made? the descriptions and spec are identical. Ive asked JEGS where it is made.

or this one?
https://www.rockauto.com/en/moreinfo.php?pk=292152&cc=1079984&jsn=484
Exactly....As long as you are going with the OEM replacement parts, it is hard to know. So the choice becomes that, or a much more expensive, race rated one. For a street car, I know I would try one of the cheaper ones..... but no one can really tell you how good and reliable it will be; that just seems to be the nature of replacement parts these days.

There are valid reports of rings shifting and even flying off, but how hard the engines were used, I don't know. My son's 340 has a Pioneer OEM type damper on it, but has not been run very hard in it's 1000 (or so) miles.