Main Crankshaft Bearing Set (Mk3)(B4)(Mk4 ALH)
Kolbenschmidt (OE Supplier)
When Kolbenschmidt (OE supplier to VW) offers main bearing sets they use a full oil channel on the #3 main to provide more oiling to the thrust bearings. In other words, you'll used the channeled bearings for all upper shells, a channeled bearing for the #3 cap, and non-channeled shells for main caps 1, 2, 4, and 5
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