904 differences

you can put 5 alto red and kolene steels in the 4 disc drum....you need the .061 thickness disc..and .068 thickness kolene steels..you need at least .060 clearance in the front drum...

i usually set my at .070....i take the pressure plate to a machine shop and he surfaces/grinds it .010 to get the extra clearance...

I have done 4 904s like that....3 are being used...one in reserve...