Another serious issue with a 50 year old balancer is that the rubber deteriorates
badly without being obvious from the outside. This causes the top to slip in relationship to the bottom ring. This causes a vibration as well AND as it slip makes the timing wildly inaccurate as the top moves in relation to the crank. I scribed line in the old days so I could see the top move. I had one actually explode on my Max wedge Car in the 60's and it made a heck of a mess and looked like a Grenade had gone off. It did it through the lights and left a crater that looked like a Land Mine went off!
If you car is fairly fast =
NHRA will NOT let you near the Track with the old stock one on your engine.
Also the Cast Cranks had a pretty large slab of a balance weight between two
of the Converter bolts near the outside of converter. Thru the 60s and 70s my Mom ran a large Wrecking yard in So Cal. I saw an awful lot of odd stuff and that
is from where most of my stock parts came from that I still have in the shop today!
