Well, you're right.... The only thing I might say is that it is often beyond the abilities of the average enthusiast, and more labor intensive than a lot of people care to do.

We know the port widths are safe for the rings as designed/delivered by the engine maker. Cleaning up the ports a bit and raising the exhaust timing to 150 degrees is a pretty safe and proven power booster for people that just want to tinker and gain some power, given that they also pay attention to carb size and muffler flow.

AV8TOR