We dont have a lot of real hardwoods out west, but my stock 346, which i've only run a bit, would be hard pressed to run well with a 20 inch bar. The modded one is a different story, but I still prefer to run it with a 16 inch bar. I bought an 18 for it, am expecting that length to be optimum for versatility anf good for speed. Now that i have a modded 357 by Ed Heard, I'm using the 346 less, but it is still one amazing saw..modded that is. (50% faster than stock!)