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Dart 31837111

Dart LS Next Engine Block Cast Iron 4.000 / 9.240


Ships directly from the manufacturer on 08/22/19
Save $20 off $250, $40 off $500, $100 off $1,000. Promo Code: RACE2SAVE exclusions apply

SAVE $135.81
Truck Freight:$119.00
Dart LS Next Engine Block Cast Iron 4.000 / 9.240 $2,580.49
Out of stock
LS Next Engine Block
  • GM LS-series
  • 4.000" Bore
  • 9.240" Deck
  • Standard Cam Location
  • 4-Bolt Steel Main Caps
  • Cast Iron
  • Dart 31837111 Details

    Iron Blocks

    Designed from a clean slate approach the LS Next Iron block has addressed the shortcomings of the LS platform and is the ideal candidate for hot rodders, drag racers, circle track competitors, off-roaders, and high performance marine enthusiasts.

    By utilizing conventional style main caps and oil pans with LS rotating assemblies and related components, Dart has addressed the windage and oil control problems which result from the factory LS engine’s separated crankcase bays.


    • Priority main oiling system
    • Siamesed cylinder bores with extra thick walls
    • Cylinder barrels extended .375" at the bottom
    • Extra thick decks ensure reliable head gasket seal
    • Blind head bolt holes don’t go through to water jacket
    • Scalloped water jackets increase flow around cylinders for better cooling
    • Clearance for 4.100" stroke w/ steel rods
    • Splayed outer bolts on middle main bearing caps
    • LS or Gen I style motor mounts
    • Provisions for OE stock roller lifters and cam
    • Uses stock timing covers and stock rear cover
    • All OE bolt holes for starter, water pump, etc
    • Driver or passenger side starter mounts


    Sold individually
    Rear Main Seal Style
    Engine Block Material
    Cast iron
    Main Journal Type
    LS mains
    Cam Bearings Included
    Engine Block Style
    Stock/OEM standard deck
    Finished Cylinder Bores
    Freeze Plugs Included
    Main Bearings Included
    Main Cap Fasteners Included
    Main Cap Material
    Main Caps Included
    Raised Cam Location
    Deck Height (in.)
    Main Bolt Style
    Cylinder Bore as Shipped (in.)
    Cylinder Bore Diameter (in.)
    Manufacturer's Part Number:

    Dart Unleashes the Full Potential of the LS Engine Platform
    With the LS Next Engine Block!

    The LS Next block is the first significant change in the bottom end architecture of the LS engine platform. By eliminating the ''Y-block'' design and utilizing conventional style main caps and oil pans, (stock pans can be used with Moroso oil pan spacers) Dart has addressed the problems resulting from the LS engine's separated crankcase bays. Windage is greatly reduced, resulting in increased power and improved lubrication.

    This design change led to several additional improvements. The main webs are significantly stronger because the bay to bay breathing windows are eliminated in Dart's design. Deleting the windows also allows the cylinder barrels to be extended by .3750'' into the crank case, providing greater piston support at the bottom of the stroke. Two standard bore sizes are available, 4.000'' and 4.125''. Maximum bore of 4.220'' for iron and 4.165'' for aluminim, or optional Darton M.I.D. sleeve kit allowing up to 4.220'' bore.

    All stock and aftermarket LS components can be utilized. Conventional style 4-bolt steel main caps are used. A 5/8'' thick full deck design is utilized for superior strength, with six head bolts per cylinder to provide secure clamping. Dart's priority main oiling system ensures high rpm reliability and includes provision for oil restrictors in the lifter valley.


    • Dart's LS Next block is cast in the USA with premium cast iron alloy or aluminum
    • Conventional style 4-bolt steel main caps with 7/16'' bolts are used
    • Full main webbing for maximum bottom end strength
    • Cylinder barrels are extended by .3750'' at the bottom, providing greater piston support for all combinations
    • 9.240'' deck height, with options of 9.450'' are available which allows for a possible effective barrel length of 9.825'' deck block
    • Extra thick Siamese cylinder bores allow for larger displacement capacity and a max bore size of at least 4.220''
    • A 5/8'' thick full deck design with a 9.240'' deck height
    • Six head bolts per cylinder provide secure clamping for power adder applications
    • Head bolts are upgraded to 7/16" for increased strength
    • Blind head bolt holes don't go through into the water jacket
    • Provision for oil restrictors in the lifter valley
    • Revised low restriction priority main oiling system
    • Pro-Stock / Pro-Mod big block style stepped main oil galley
    • An external oil filter must be used with stock or aftermarket oil pumps
    • Dual starter mounts
    • The water jacket on the #1 cylinder has been expanded for additional cooling capacity
    • LSX style lifter bosses and dog bone provision are provided


    Items You Need

    Some parts are not legal for use in California or other states with similar laws / regulations

    Motor Vehicles

    WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.


    WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

    Electrical Cords

    WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.