My 340 build


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$112.99

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  Main Bearings, H-Series, TM-77, Standard Size, Dodge, Plymouth, 318, 340, Set of 5
  
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  • Overview
    Brand:Clevite Engine Parts
    
    Manufacturer's Part Number:MS-540HX
    
    Part Type:Main Bearings
    
    Product Line:Clevite H-Series Main Bearings
    
    Summit Racing Part Number:CLE-MS540HX
    
    
    UPC:27067452498
    
    Bearing Usage:performance
    
    Grooved Bearing:Yes
    
    Groove Location:Upper
    
    Groove Style:1/2
    
    Bearing Material:Tri-metal, TM-77
    
    Quantity:Sold as a set of 5.
    
    Notes:Bearings have 0.0010 in. more oil clearance.
    
    Description: Clevite H-Series main bearings were developed primarily for NASCAR racing, but are well suited to other types of competition engines as well. They're especially good for engines that run at medium-to-high revs. They have steel backings with carefully selected overlays and a high crush factor, plus a medium level of eccentricity. 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

Same part number differant description.
Looks like the H series can be either full group or just half Groove and you can get them in the .0010 extra clearance size.