MS1266H MAIN BEARINGS

The MS1266H bearing are narrowed for a crank with a large fillet .....the standard main bearing by speed pro...king or even clevite do not work...the standard bearing work with a standard crank...

H-Series bearings have enlarged chamfers at the sides for greater crank-fillet clearance and are made without flash plating for better seating. They are also available with either 180 degree or 360 degree oil grooves, as well as an extra 0.001 in. of clearance.