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If you mean should it have weights attached to it like the 400 SBC flywheel does then the answer is no....as the 350 is an internally balanced motor....not sure if that is the answer you were looking for:)
 

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Hi,

They were internally balance until the mid eighties when the went to the one piece rear main seal. These motors are externally balanced in rear only. The front is still neutral.


Jeff
 
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