Gotcha. I think its just the loose use of terms like "big cam" "high horse power" engine. And such. Not that you are using them improperly, they are just taken differently by others. A 1500 horse turbo car can idle smoother than a 300 horse sb. Anyways besides the point, and it appears you got some guidance on your original question. I know of several production engines that were internal balance, but have external balance flexplates. As the boys mention above if it was balanced like that, probably not an issue. Good luck!
