If I decide to build a 383 lt1 that is internally balanced, will it require a new damper or can the stock damper be used? Will I also need a new flexplate? Will the stock fuel pump be up to the task of providing fuel for this application? Just to let you know it probably will be a 383 with a cc503 cam and le1 heads and mac headers through a hooker aerochamber muffler. I know it is not the best set up but for now it should work.

 

Stock damper is neutral balanced, and can be used with in internally or externally balanced rotating assembly. The flexplate has to match the type of balance, neutral balanced for internal, counterweight attached if external.

Results with the stock pump vary all over the place, probalby a result of the pump age. A new pump is cheap insurance.