Who builds reliable race/street engines?

Caco2120 said

You're insinuating its REQUIRED in your other post. Its Not.
If you need a replacement flywheel, balancer, whatever, do you tear the engine down and rebalance? No...b/c the flywheel is already at a spec...be it 340 balance, 360 balance, etc. I understand exactly how it works, and I fully trust that a company producing 50+ engines a day is well beyond capable.

Click to expand...

Ever balance a crank? If you have, you’ll know a zero balance flywheel bolted to a balanced crank WILL change the balance. Every time. The question is, how much does the balance change when you bolt the flywheel on.

It depends. If you make the flywheel zero it’s still never zero. And the weight is further from center by far than the crank weights.

So a few grams on a flywheel becomes much greater when it’s bolted to the crank. Now, add the disc and pressure plate and you have a hot mess.