I believe it is important to have it done. If you want a long lasting and easy rev'ing engine. In any type or perf. type build I would say it is a must. Some places sell rotating assemblies that they will balance for you. Just some thoughts but I would say yes have it done for you.
Yes. I had the internals, harmonic balancer, and flywheel balanced together.
I then swapped flywheels to one of those "400 balancer plates" you see for sale and a 350 flywheel. It about shook the car apart at freeway speeds. I took that junk off and put a new Hayes flywheel on it and it's as smooth as a baby's ...whatever.
Well the way you worded the question. The easy answer is NO. They do not HAVE to be balanced but, all engines (rotating assemblies) SHOULD be balanced. If you want a smooth running engine that doesn't eat up bearings, etc.. balancing is money well spent doesn't matter if it's a 302 (ford) or a 454 (chevy) all engines should be balanced.
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