I purchased an engine that has the Powerhouse (Enginekits.com) 383 stroker kit in it using their cast crank. The engine didn't come with a harmonic balancer or flexplate and I'm having a hard time determining if their crank is designed as an internally balance crank, or externally like a 400 crank so I can buy the right pieces.

I've tried contacting enginekits.com but I can't get anyone to respond.

Does anyone here know if their crank it internally or externally balanced?