52 Beastie Have a 51 235 in a 51 6400 ,rolled in a set of minus .002 bearings had the pan off twice carefully cleaned each time,now have agood daily that needs a quart in 6 months give it 2 oz. ZDDP each quart. Seems like it is pretty happy. does good at about 48 MPH up to 53 or 54 ,much more and your hammering it !!
