MS1266H MAIN BEARINGS

70aarcuda said
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.
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My machinist only wants to use the H series in Clevite or also that version in a King if they even offer anything. He told me yesterday that the H series may not even be available anymore and possibly all you can get is the HG series but he is still researching things