Dart 31162211 SHP Cast Iron Small Block Chevy Engine Block 4.125" Bore 400 Mains

The Dart 31162211 Special High Performance (SHP) engine block is a precision-machined cast iron bare block designed for small block Chevy applications requiring reliable performance and durability. This block features 400 main journals with a 4.125-inch unfinished bore and 9.025-inch deck height, making it an ideal foundation for builds up to 600 horsepower.

Key Features:

• Cast from superior high-nickel iron alloy for enhanced strength and durability
• 4.125-inch unfinished bore allows custom machining to your exact specifications
• 400 main bearing journals (2.650-inch) provide increased strength over 350 mains
• Splayed 4-bolt main caps on center three positions with 2-bolt on front and rear
• Priority main oiling system directs oil to main bearings first for improved lubrication
• Siamese cylinder bores with .230-inch minimum wall thickness at 4.165-inch bore
• Extra thick decks (.625-inch minimum) ensure reliable head gasket sealing
• Blind head bolt holes prevent coolant intrusion
• Scalloped water jacket walls improve coolant flow for better engine cooling
• Provisions for OEM hydraulic roller lifters and cams with factory mounting bosses
• Compatible with 1981-1985 stock oil pans and passenger-side dipstick
• Two-piece rear main seal design
• Accepts standard starters, bellhousings, and timing covers

This bare block does not include cam bearings, freeze plugs, or main caps—allowing you to customize your build with your preferred components. Designed for hot rodders, drag racers, circle track competitors, off-roaders, and marine enthusiasts seeking a fresh, precision-machined alternative to rebuilding aged cores. Maximum recommended bore and stroke is 4.165 inches x 4.000 inches with clearance machining.