GM Performance Engine Block, Cast Iron, 4-Bolt Mains, 4.117 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, Small Block, Each (PART #GMP-12480157)

These GM Performance Bowtie Sportsman engine blocks feature siamesed-style cylinder walls for maximum durability.

Additional features include:

  • Nodular iron splayed main caps
  • Grade 8 main cap fasteners
  • Priority main bearing oiling
  • CNC-machined cast iron block
  • Finished cylinder bores
  • Available 1-piece or 2-piece rear main seal

SPECIFICATIONS

Brand GM Performance
Manufacturer's Part Number 12480157
Part Type Engines, Bare Blocks
Product Line GM Performance Bowtie Sportsman Engine Blocks
Main Journal Type Chevy 350
Engine Block Material Cast iron
Engine Block Style OEM
Engine Block Deck Height Standard deck
Deck Height (in.) 9.025 in.
Cylinder Bore as Shipped 4.117 in.
Cylinder Bore Diameter 4.155 in.
Maximum Bore Diameter (in.) 4.155
Camshaft Location Standard
Main Bolt Style 4-bolt
Main Caps Included Yes
Main Cap Material Nodular iron
Main Cap Fasteners Included Yes
Main Bearings Included No
Rear Main Seal Style 2-piece
Finished Cylinder Bores Yes
Raised Cam Location No
Cam Bearings Included No
Freeze Plugs Included Yes
Remanufactured No
Quantity Sold individually.