Dart LS Iron Block - 9.240/ 4.125 w/Steel Main Caps 31837211

The LS platform dominates performance builds, but factory design compromises—particularly windage loss and oil control in separated crankcase bays—leave power on the table. Dart's LS Next Iron block solves these fundamental issues with a clean-sheet design that combines conventional main caps and oil pan compatibility with modern LS rotating assemblies, giving you superior oiling efficiency and reliability whether you're building a drag car, circle track competitor, or high-powered street machine. The result is a purpose-built foundation that addresses what factory engineers couldn't without sacrificing the parts compatibility serious builders depend on.

• Engine block only
• Bare iron casting
• 4.125 inch bore
• 9.240 deck height
• 4-bolt main caps
• Steel main caps included
• 1-piece seal design
• 0.375 inch extended cylinders
• Siamesed cylinder bores
• Extra thick deck
• Extra thick walls
• Priority main oiling
• Blind head bolt holes
• Scalloped water jackets
• 4.100 stroke clearance
• Splayed outer bolts
• LS or Gen I mounts
• Stock roller lifter compatible
• Stock timing covers
• Stock rear cover
• OE starter provisions
• Driver or passenger starter
• Dart MPN 31837211