Quote:
Originally Posted by 433lemans
This brings up an important issue for me. I have an assembly that I had done years ago. I can't for the life of me remember which flex plate I included when the machine work was done. I have the factory flex plate that was balanced with another project a long time ago, and I have an aftermarket internal, and an aftermarket external balance flex plate. The shop that did the work used to be reputable but work I had them do more recently led me to believe otherwise. Is there a safe way to go or do I take everything back to a shop? Sorry if I'm taking away from the OP.
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If you sent it with a flywheel and don’t recall which type it was, I think you’re probably out of luck on being able to tell which type it had. I have been around a ton of Pontiac’s that were internal balanced but they used the OEM flywheel thinking it was internal balanced. To be more than just a guess you will probably need to have the crank spun on a balancer again with the correct bob weights. I wouldn’t think it would be very expensive to do though. For neutral balance it does need to be checked with a flywheel. If it comes up being off and needs an adjustment on the back counter weights when spun without the flywheel it was likely balanced for the external flywheel.