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Secondly, a 5.9Mag motor doesn't have a balance weight on the torque converter, it has the factory imbalance for the rear of the engine built into the flexplate.





This is NOT true.

I have one sitting in my garage that came out of a van with a weighted torque converter.

Chrysler did at some point go to the flexplate with the weight on it but its a false statement to make indicating all 5.9 magnums came with it. Best thing to do is simply check the date on the block.

Looking at the heads will get you in trouble, you can run some LA heads on early magnum blocks.

Check the date and check to see if there is a crank trigger mounting pad on the back of the block.