The Dart Small Block Chevy Iron Eagle 4.500 Bore Space Block was created by spreading the cylinder bore centerlines from the standard 4.400" to 4.500", large bore sizes can be achieved with adequate head gasket sealing space between the cylinders. Bosses are added at the ends of the decks to accommodate two extra head studs, increasing clamping loads and improving gasket sealing. The extra studs are also provided for in Dart's new 4.500" bore space cylinder heads. These new blocks are ideal for big inch competition engines. The cam location is raised .391" and oil pan rails are spread .400" per side on both the iron and aluminum blocks, providing lots of room for stroker crankshafts while eliminating the need for fragile small base circle camshafts. Big block cam bearing journals are standard!

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Features:

• Deck Heights: 8.850", 9.025", 9.075", 9.325" & 9.500"
• Bore Size: 4.180''
• Raised camshaft: .391''
• Oil Pan Rails Spread: .800" wider than stock
• Main bearing bores: 350 (2.45") & 400 (2.65")
• Main Caps: Splayed 4 bolt Billet Steel
• Cam Bearing bores: Big Block or 50mm
• Dual Starter Mounts
• Oil Inlets: Front & Rear External
• Scalloped Outer Water Jacket Walls
• Includes: Coated Cam Bearings, Freeze Plugs & Dowels Note: Requires Race Series 9-Degree or Little Chief Cylinder Heads