2500hp rated Dart LS Next Iron Short Block


Our 2500hp rated Dart LS Next Iron Short Blocks for Forced Induction applications, are fully machined, balanced & blueprinted. Ideal for daily drivers and street or strip cars.

Based on a Dart LS Next Iron block, Callies Magnum CCW Crankshaft, Callies Ultra Rods and JE Custom Forged & coated pistons with Total Seal Gapless & Gas-Ported AP Steel Piston Rings.

Single or Twin Turbo. An external crank trigger wheel must be used with this engine.

Please contact us before ordering this engine to discuss your engine requirements. 

    • $
    • additional $
    • additional 937.81 $
    • additional 287.27 $
    • additional 250 $
    • Additional $
    • Additional 417.99 $
    • Additional 742.33 $


Start your build right with our 2500hp rated Dart LS Next Iron Short Block, for Forced Induction applications.

All our engines are fully machined, balanced & blueprinted. Ideal for daily drivers and street or strip cars.

We like to get to know our customers, their cars and what kind of engine/power they are looking for. Please contact us prior to ordering, to dial in the spec to meet your engine requirements.

We provide all our clients with a full engine spec and surface reports.

Set up includes, but not limited to the following machining/blueprinting:

  • Balancing
  • CNC Block Machining
  • Cylinders double torque plate diamond honed for correct piston to wall clearance and surface finish
  • Full surface finish report on deck, head and cylinder wall finish 
  • Engine fully blueprinted


  • 2500hp rated Dart LS Next Iron short block
  • Bore & stroke –TBD
  • Engine size – 388ci/408ci/427ci 
  • Piston Dish – TBD


  • Dart LS Next Iron Block 4.125 bore Deck height 9.240″
  • Callies Magnum CCW crankshaft 3.625″, 3.750″ or 4.000″. 
  • Clevite H Series Main Bearings 
  • Clevite H Series Rod Bearings
  • Callies Ultra Enforcer I Beam 6.125″ rods
  • JE/ACE racing custom forged & coated pistons w/upgraded super duty pins
  • Total Seal Piston Rings AP Steel Gapless and Gas Ported Ring Pack

Optional Upgrades:

  • Dart LS Next2 Iron upgrade to 1/2 main studs
  • Dart LS Next2 upgrade for 1/2 head studs
  • Cleveland Mains available (Please call to discuss)

This 2500hp+ turbo LS iron short block is based on a twin or single turbo application tuned professionally. We recommend FuelTech EFI for this engine.

Long Blocks and Complete Crate engines also available.

We work closely with our suppliers to keep on top of, and be a part of new innovations in our industry. Click here for more information about Total Seal Gapless & Gas-ported Piston Rings.




ACE Racing Engines makes no guarantee regarding operation of the Goods in settings or in ways that may be illegal or highly regulated, including those regarding smog and emissions. Please refer to your State/Country guidelines. 


Additional information

Weight 300 lbs
Dimensions 42 × 40 × 26 in