x275 Class Legal 364ci Dart Aluminum LSN2 Long Block

Our x275 class legal 364ci LSN2 Long Block is the ideal engine combination to make big power and be competitive in the x275 drag radial class.

The 364ci size allows you to get the 150lb sub 365ci weight break.

This all new, fully CNC Machined, blueprinted and Dyno tested long block engine comes with an Engine Specifications File for your records. 

Price shown does not include oil system –  A wet or dry sump oil system can be added if required, please call to discuss and obtain a custom quote.

Price does not include Damper and timing pointer.


  • 2500hp rated Dart LS Next2 Aluminum
  • Bore & stroke – 4.000″ / 3.622″
  • Engine size – 364ci
  • x275 Drag Radial Class Legal – see class rules here

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

  • Balancing
  • CNC Block Machining
  • CNC Deck Block
  • Align Hone
  • Cylinders double torque plate CNC diamond honed for correct piston to wall clearance and surface finish
  • Cylinder heads machined for for top fuel hoops
  • Block machined for receiver grooves
  • Full surface finish report on deck, head and cylinder wall finish 
  • Engine fully blueprinted
  • Heads CC’d and valve job
  • Valve spring heights set up 
  • Pushrod length
  • Rocker geometry
  • Dyno Test
  • Dyno Data sheets

Short Block Components:

  • Dart LS Next Aluminum 4.125″ bore w/ Cleveland Mains
  • Callies Ultra Billet crankshaft
  • Clevite Coated Rod Bearings w/ dowel
  • Clevite LS Next Coated Main Bearings
  • MGP Billet aluminum 6.125″ rods w/ .990″ pins
  • Custom Ross Racing Pistons
  • Total Seal Piston Rings

Long Block Components:

  • CID Cylinder Heads 
  • Clarke Copper Cylinder Head Gaskets
  • Custom Camshaft
  • PSI Racing Springs
  • Custom Manton push rods
  • Jesel Roller Rockers
  • Jesel Lifters
  • RCD Billet Gear Drive
  • Rear timing cover & gasket
  • Warspeed/ACE Racing Engines Tall Billet valve covers (black or raw)

Price shown does not include oil system or damper and timing pointer –  A wet or dry sump oil system will need to be added, please call to discuss and obtain a custom quote.


 – 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. 

 – Due to the custom nature of our builds, the product images shown here are for illustration purposes only and may not be an exact representation of the product.