360 Internal or External Balance??

whether or not a crank is internally balanced has nothing to do with cast or forged...

it has to way the weight of the piston/rods in comparison to the weight of the crank....

cast cranks are not as heavy as forged...they weight less...so weight must be added by some means...hence...weight added to balancer and converter.

if light weight pistons and rods are used with cast crank...it is possible that weight is not needed on balancer/converter...

so...it depends....