Dart LS Next Iron Engine Block LS Chevy 4.125" Bore, 9.240" Deck Height
Dart LS Next Iron Engine Block LS Chevy 4.125" Bore, 9.240" Deck Height
  • Load image into Gallery viewer, Dart LS Next Iron Engine Block LS Chevy 4.125" Bore, 9.240" Deck Height
  • Load image into Gallery viewer, Dart LS Next Iron Engine Block LS Chevy 4.125" Bore, 9.240" Deck Height

Dart LS Next Iron Engine Block LS Chevy 4.125" Bore, 9.240" Deck Height

Regular price
$4,576.00
Sale price
$4,576.00
Regular price
$4,928.00
Sold out
Unit price
per 
Tax included. Shipping calculated at checkout.

Dart LS Next Engine Block LS Chevy 4.125" Bore, 9.240" Deck Height

  • Part Number # 31837211
  • Material: Special RMR Iron Alloy
  • Bore: 4.125"
  • Bore & stroke: 4.200" x 4.100" max
  • Cam bearing bore ID: 2.2998" – 2.3002"
  • Cam bearings: 55mm babbit Dart PN# 32210101-5
  • Cam bearing O.S. +.010", +.020", and +.030" available
  • Cam bearing press: .002" - .003"
  • Camshaft position: Stock LS cam position
  • Camshaft to crank ∅ 4.885"
  • Camshaft snout: 1.565" O.D
  • Cam Drive: Accepts belt drive (*machining required) or stock chain drive.
  • Cam retaining plate: Dart cam retaining plate w/bolts Dart PN# 32226000
  • Cam Plug snap ring: N/A
  • Cubic inch: 454 cubic inch max
  • Cylinder Wall Thickness: .275" @ 4.185" bore
  • Deck Height: 9.240"
  • Deck Thickness: 5/8" (.625")
  • Fuel Pump: Electric pump required
  • Fuel Pump Pushrod: N/A
  • Freeze Plugs: 1.500" diameter Dart PN# 32820000B (Qty 6)
  • Lifter Bores: .8427" - .8437" up to .937" keyed w/ 1.062" dia. bushing
  • Main bearing size: 2.558" – 2.559" Dart PN# 9-MS2321H or 9-MS2321HX
  • LS Next² 2.750” Main uses bearing 9-MS1010 or 9-MS1010HX
  • Main bearing bore: 2.7508" – 2.7512"
  • Main caps: 4 bolt billet steel w/splayed centres & centre thrust
  • Oil system: Low volume priority main oiling system w/ centre crossover
  • Oil Pump: Melling or Stock LS oil pump
  • Oil Filter: Must use remote oil filter w/-10AN O-ring Fittings
  • Oil Pan: Special: Moroso, Canton and Stef’s or Moroso pan rail spacers
  • Rear Main Seal Stock LS style with factory cover
  • Serial No. Front passenger side below deck surface (XXXLSN)
  • Sleeve OD: N/A
  • Sleeve O.S. N/A
  • Sleeve thickness: N/A
  • Sleeve Length: N/A
  • Starter: Factory LS starter w/ driver and passenger mounting options
  • Main bolts: Inners – 7/16" x 3.600" Outer – 7/16" x 2.900"
  • Studs, heads: Call for application 
  • Studs holes, Head: 6 bolt (per cylinder) pattern with 7/16", 3/8", and 8mm sizes
  • Stud length in block: 1.000" of thread depth
  • Timing chain/gears: 24x or 58x depending on application
  • Timing Cover: 2005-up Factory LS cover and front seal w/cam sensor provision
  • Torque Specs: All torque specifications w/ CMD #3 High Pressure Lube
  • 3/8” = 35 ft lbs 7/16" = 65 ft lbs 8mm = 22 ft lbs *1/2” = 105 ft lbs
  • Weight: 227 lbs w/ main caps

 

Dart LS Next Engine Block Oil Pan Rail Adapter / Spacer Kit Sold Separately 

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 utilising 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.

FEATURES

  • Priority main oiling system with two lifter crossovers and restrictor provisions.
  • 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 available in 7/16″ or 1/2″.
  • Scalloped water jackets increase flow around cylinders for better cooling.
  • Clearance for 4.100” stroke w/ steel rods.
  • MUST BE clearanced for centre counterweighted crankshafts.
  • Splayed outer bolts on middle main bearing caps.
  • LS 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.
  • Parts kit sold separately (PN: 32000016)