Can I use my old flywheel and harmonic balancer from my old motors, they are gen.4 motors with 2 piece rear main seal? The stroker kits are internally balanced I think.

If your gen iv's are 454's you will need new flywheels ...454'a are externally balanced...Same with balancer

need 396-427 type...and you better get the engines balanced !

The stroker kits are internally balanced.

6.385 rods and forged crank?? dont buy the assy ballanced,,the machine shop will have to check it again and they can machine the weight off the flywheels and like mentioned you will need a 396-427 harmonic lancer..

Yes the rods are 6.385 and the crank is a 4340 crank.