No,I don't have 400 issues..just issues with my 400 sbc.thought I'd clarify. Anyway,after having my truck sitting for a year and getting a heart transplant,and solving my timing,no start,electrical problems,I've been experiencing bad vibrations, and rough running.After using the search function,I realize that I get to pull the engine again. I didn't know at the time of the engine swap(350-406)that the 400 block uses an externally balanced flywheel. I guess I should've researched the swap a little more. So,the question is,what kinda $$ can expect to pay for a flywheel for the 400?Is there any specific brand,etc?thanks,guys!