H Series Main Bearings STD - RB Engine - SMALL THRUST

Size: STD / Series: H / Material: TM-77 / Journal Size: 2.750" (RB Engine) / Oversized Fillet Clearance Champher: YES / Oil Groove: 3/4" narrow. Originally developed for Nascar racing, H series are made of TM-77 material, however they are not flash plated with the lead/tin apparently in an effort to help them seat better. They also have enlarged champhers to help them clear bigger crankshaft fillets. They also have a medium level of eccentricity. A good overall performance bearing. These have the smaller thrust surface, which was originally designed for 1973 and earlier RB engine blocks, but will fit RB engine blocks of all years.