Bare Engine Block #4500009 Big-Block Chevy, 2-Piece Rear Main Seal, Siamese Bore

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Edelbrock engine blocks are the ideal starting point for any high-performance build that demands the quality and precision of an American-manufactured product. The Edelbrock Big-Block Chevy Block #4500009 is an unfinished bare cast-iron engine block with a rough bore size of 4.495-inches (+/- .001), a rough deck height of 9.813 inches (+/- .005), and a cam bearing bore ID of 2.120 inches with a two-piece rear main seal. The unfinished deck and bores allow an engine builder to machine the block to nominal deck heights and bore diameters using their own finish specifications. This BBC #4500009 Block features Siamese cylinder bores and splayed four-bolt mains to meet the demands of a high-horsepower build. Features include a standard BBC head bolt pattern and camshaft position, standard BBC main bearing size, standard BBC starter location, and compatibility with standard BBC (Gen IV, V and VI) timing chain, gears and Mark IV 10-bolt timing cover.

Documents & Installation Notes


Availability Available
Application Application Specific
UPC 00085347895854
Quantity Sold Individually
Main Bearing Cap Bolt Quantity 4-Bolt
Availability Note Available to Order
Warranty 12 Months
Cap Material Ductile Iron
Emissions Code
Hazardous Materials Warning WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit
Installation Notes
  • Requires machine finishing by a qualified engine builder or machine shop
Cylinder Bore Diameter (Max Recommended) 4.600 in
Deck Height (Rough) 9.813 +/-.005 in
Fuel Type Gasoline
Material Cast Iron