stroker engine balancing

The aftermarket cranks,both cast and forged,are mostly designed to be internally balnaced.The targeted bob weight for the 4" cranks seems to be around 1850 grams,that seems to be the average for cast and forged and also different brands.Therefore ,using a standard 6.123 rod and any of the forged pistons available,this bob weight is easily acheived without having to add heavy metal to the crank. An H beam rod avereages about 40 grams heavier than an I beam rod,a cast or Hyperutectic piston is heavier than a forged piston.For example : a Scat 7/16 bolt I beam rod weighs 591 grams,a Wiseco Pro-Tru forged flat top piston and pin are 566gr,spirolocks are 4 gr,rod bearings are anout45gr,a typical ring pack is about 49gr.The bob weight for this combo would be 1728gr which is well below what the crank is designed for,this means the you have to remove material from the crank counterweights to get the crank to balance.If your bob weight is more than what the crank is designed for then you have to add heavy metal to it to internally balance it or use a balancer and flywheel with a counterweight and externally balance it.