the best (and most expensive) front bearing on the market is the new double shield on the outside of the bearing novarossi . it is the on that comes in almost all the new nova engines . i use tko ceramic front engine bearings for replacements . i take one side of the shield off to allow the bearing to get lubricated during running . i take bothe seals off and determine which of the seals has more rubber on the inside of the seal as to make a better seal and install that seal on the side with the open balls and install in the engine .