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Return to Parts List Category : A- Small Block "LA" : Bearings : Main 273,318,340 : +.010" M77 MS540P10 MAIN BEARING SET 318-340 CLEVITE 1957-1973 BLOCKS, NARROW FLANGE 3.374" -1/2 GROOVE TRI-METAL $139.99 Clevite 1957-1973 Blocks, Narrow Flange 3.374" -1/2 Groove Tri-Metal This is a full set for a V8 engine.  P-Series main bearings are the oldest members of the Clevite 77 bearing family, and are intended for high-revving engines. To compensate for the high load factors and distortion in these engines, they have higher eccentricity and a high crush factor. P-Series bearings are built on steel backings with extra-thin overlays, to prevent overlay fatigue. In addition, the oil grooves on most applications extend all the way around both halves for better oiling.