am_muscl

iTrader: (19)

How do I know if I should go with an internally or externally balanced flex plate? The motor is a 355 with forged eagle rotating assembly. Idk if it was zero balanced but in the description of the motor it says it was balanced so idk if that means it was zero balanced so I have to find a special flexplate or what.

Jeff400w

If the engine was balanced, you will use a zero balance flex plate.
An unbalanced stock rotating assembly needs an externally balanced flex plate.

95TAVERT

My 383 LT1 forged Golen SB is internally balanced and it uses a TCI #399174 if that helps any? it just depends if it internally balanced or externally balanced? Good luck.