School me on balancing an engine.

68fastback said

So for an internal balance I can just bring my crank rods and pistons and have them balance that? What do I need for a flex plate and dampener? Or do I bring them as well?

Also does the crank pistons and rods need to be put together or do they do that when they balance it?

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If you don't have your flexplate or harmonic balancer yet; you can get your assembly internal balanced; then when you get your harmonic balancer and flexplate, make sure you get ones that are neutral balance (meant to work for internal balanced engine).

You don't need to put any components together.

The best thing would be just to call your machine shop and ask them what to bring. Most shops are eager to help and don't mind you asking questions (they are used to it).