SEALED POWER MAIN BEARINGS SBC .030 (Bi-metal aluminum alloy, A-Series) Calipers GM Large Single Bore Calipers

GM Large Single Bore Calipers w/ Pads

Zinc Bottom Mount Bracket

75" w/ 7/16 Studs & 5x4

Vandervell engine bearings company was superseeded when brought out by clevite

vacuum applications

SEALED POWER MAIN BEARINGS SBC .030 (Bi-metal aluminum alloy, A-Series) Calipers GM Large Single Bore CalipersSealed Power MA Series Main Bearings 4663MA30 Main Bearing Set, . 030 in. Over Size, Bi metal aluminum alloy, A Series, Sold as a set of 5. These Sealed Power MA Series main bearings can actually polish the journals on your crankshaft. That's because there's a small percentage of silicon mixed in with the aluminum and tin that make up the bearing surface alloy. The silicon is there for wear resistance, but its toughness actually smoothes the journals