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I have a 408 stroker 360 that is exturnally balanced. If I switch the harmonic balancer, do I need to have the motor rebalanced? What if I keep the same flex plate and neutrally balanced torque converter?



If the balancer is external you are good to go, if it's internal balance...You will need to get the motor balanced and use a neutral balance flex plate.

2001 Dodge Dakota
408 All Motor
11.27 @ 117.83 mph
2017 NM Mopar Challenge Series Champion.