Re: counter weights on the crankshaft
They are both welded and bolted on usually. Installed by someone who knows what they are doing. They need to be extremely accurately mounted and then the crank balanced by a specialist. Not all machine shops have such balancing equipment.
You'll prolly end up paying the same amount. This is not a backyard deal
We already have a poster here with a brand new engine which was supposedly had the weights added to his crank, but there is a lot of vibration, so it is an easy guess that it was not done properly
Surely no one would try dropping the pan and bolting on the weights
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