Engine Block, Cast Iron, 4-Bolt Mains, 4.000 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, Small Block, Each. Please Click on the \"Read More\" link for additional details about this item. Thank you, Summit Racing Equipment. The World\'s Speed Shop Since 1968 Summit Racing Part Number:DRT-31161111
Dart SHP Special High Performance Engine Block 31161111
