GM Performance Parts Engine Block - Cast Iron - 4-Bolt Mains - 4.000" Bore - 2-Piece Rear Main Seal - SB Chevy 302, 327, 350

GM Performance Parts 4-bolt main bearing blocks are the basis for '73-'85 GM Goodwrench engines with standard 4. 000" cylinder bores and will accept early two-piece rear main seal.

Pit Stop USA offers GM Performance Parts Engine Block - Cast Iron - 4-Bolt Mains - 4.000" Bore - 2-Piece Rear Main Seal - SB Chevy 302, 327, 350 10066034 at low everyday prices. Be sure to check out all of our products from GM Performance Parts including GM Performance Parts Cast Iron Engine Blocks - Small Block Chevy.