360 vibration ....help

sirmopar said

Thanks for the input. Yes the weight is on balancer.

When I took the cast crank to a local machine shop the guy told me I was crazy for wanting to balance that crank and it wasn't worth it.

I assumed (I shouldn't have) the pistons and Rods would be closer than than stock and wouldn't have to be balanced. Maybe I'll try a converter, if that doesn't work should I tear down the engine , maybe look for steel crank ?

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When parts are made for an engine they have to meet weight specs so they all work together without destroying the rotating assembly, not everyone who builds an engine has it balanced. The factory doesn't balance each engine by weighing each part and this shows if you weigh each rod or piston when you disassemble an engine, they will be within so many grams of each other. Is a perfectly balanced engine better, you betcha!
As far as the guy in the machine shop, he has a job because of people like you so he should have said, "yes sir, anything else I can do for you?". With that being said I truly believe the problem is due to the removed weight that was on the converter.