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I plan on having a 400 stroker motor built soon so I was taking a look at stroker kits and see that they are available in internal, external and non-balanced configurations. Could someone please provide some information on this subject? Is the type of balancing a matter of personal preference or does the type of motor you are building dictate how it needs to be balanced?

A internal balanced crankshaft assembly, motor, needs no special externall balanced torque converter, flywheel or crankshaft balancer. A exteranl balanced motor has to have the correct and matching flywheel, flexplate, or in Mopars case, the correct external balanced torque converter. A non balanced stroker crankshaft assembly will need to be balanced with the correct components like the balancer, flexplate, flywheel or torque converter. Internally balanced components like the balancers, flywheels or in Mopars case the torque converters, are already nuetral balanced from the manufatuers so they can be bolted on any internally balance motors there designe to fit like BB Mopar V8 ,Hemi or SB and so on BTW, I always have all the rotating parts sent to the balancer so they can be check and correct any parts that are not perfect or if they need it You can't be to careful on any parts IHTHS

This explains it very correctly . need no more info . Internal balancing all the way . stroke that 400 up to a 500ci . I have a brand new internally balanced putting together now .