If it is coated (gold) , it will only be a VERY thin layer, i swap a 21-0907T to a gold coated gx series crank n it rubbed the crank case. So by adding a shim b4 collect will sort it out. i believe crank case is same n gold coated crank slightly norrower but will work.

My findings with 21-0907T crankshaft only lasted 4 gallon + n need replacement. Con rod don't wear much. Just my opinion. The stock bearing are great.