Dart LS Iron Block - 9.240/ 4.000 w/Steel Main Caps 31837111

The LS platform dominates performance builds, but factory design compromises—poor windage control, inadequate oiling, and separated crankcase bays—leave serious power on the table. The Dart LS Next Iron Block solves these fundamental issues with a purpose-built design that delivers superior oil control, cooling efficiency, and structural integrity for drag racing, hot rodding, and high-output applications. Whether you're chasing peak horsepower or bulletproof reliability in extreme conditions, this block gives you the foundation to build without limits.

• 4.000" bore diameter
• 9.240" deck height
• 4-bolt main caps
• Steel main caps included
• Iron construction
• 1-piece rear seal
• .375" extended barrels
• Siamesed cylinder bores
• Extra thick cylinder walls
• Thick deck design
• Blind head bolt holes
• Priority main oiling
• Scalloped water jackets
• 4.100" stroke compatible
• Splayed outer bolts
• GM LS-Series compatible
• LS or Gen I mounts
• OE stock lifter provisions
• Stock timing cover compatible
• Stock rear cover compatible
• Driver-side starter mount
• Passenger-side starter mount
• Bare block (no internals)
• Sold individually