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The 1st thing to Look @?Make sure that you have Proper Rod to Block Clearence?I had 1 of my 1st Strokers that had a Strange Noise(KNOCK) when the Motor would get Up to temp?Sure enuff,i had 1 Connecting Rod that was just barely bumping the Block!
How long of Rods are in the Motor,and are they H-Beam or I-Beam?
I would think that the Motor is Extenaly Balanced?Do you have an Ext.Balancer and Flywheel with a weight?
Hope this HELPS?
Later
G 8)