[Mgs] MG flywheel. Is there balance in our MG flywheels?

[Charles Hill]

Most engines are internally balanced.  That is, the crank and flywheel 
are balanced separately.  There are exceptions though.  From a hazy 
memory - after all, it has been 20 years since I messed with this - 400 
small block Chevys, 454 Chevys and 428 Fords are externally balanced.  
There are others, but no LBCs as I remember. 

Charles Hill