Adding 22 cubes,,, power increase? 528 to 550

Garrett Ellison said
If your running into cap walk issues with a MegaBlock, your really putting some power down. I would go ahead and have new exhaust valve seats installed to get the exhaust valve back up to it's proper seat depth. You aren't going to get any more air and fuel into it if you can't get the exhaust to scavenge properly.
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The cap walk issue isn't as bad as the first 100 passes. It was making great power and when torn down we found the new crank had a crack in it. Not serious, and it was ground out. I sold that crank and bought a Crower center counterweighted crank. I will ask about the exhaust hieght.