383 and 440 flywheel the same?

[68gtx]

are the flywheels between the 383 and 440 the same? are they balanced the same?

 

[Cranky]

There are different diameters but for the most part, they are neutral balance....depending on early model vs later ones....forged crank internal balance vs cast crank external balance. Then you have the 6 pack external balance setup. IIRC, even the 1970 440 4V high performance engine was external balance....mater of fact, it was.