1164-14B is a designed offroad crankshaft that has a tungsten weight in it, that is all that is done to that crankshaft from a standard C6 crank.

1164-14R also has the weight in it and like you mentioned it has the coating on it but the opening on the crankshaft for fuel entry is opened up a lot, it is an onroad crankshaft so it's open sooner and stays open longer. Also the middle of the crank that funnels the fuel to the turbo cuts is opened up more, the turbo cuts are also cut in deeper on the face of the crank. The timing of this crank makes the engine seem pretty violent but I love it in a truggy!!!

It looks like the site your looking at might be showing the wrong pic with the part number. Look at the last two on this page. http://www.rbproducts.com/mainEn.php...x=0&image2.y=0