340 steel crankshaft

thought older 340/318 where INTERNALY balanced thus neutral balanced fly wheel ???e

any one have comparison pics of a steel 318 and the internally balanced 340 forged crank ?? mainly the counter weight and drilling mentioned in post #5 difference ??

I may have a poly 318 honey hole !!!! advailable

Drilled Counter Weights on 340 are ONLY difference in the cranks