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Re: 1972 GM 350 throbbing engine vibration
The SBC 400 engines used a har. balancer & flywheel/flexplate with balancing weights built in. Sometimes someone will put one of these on the internal balanced engines, 85 on back. It will cause a serious vibration problem. A customer came in with one years ago. I removed the flywheel cover & could see the weight on the flexplate. I went up through the opening & cut off the weight. That solved the problem & saved removing the trans. The fly./flex. on an 86 up 1 piece rear seal engine will not fit on the earlier engines.
George
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