Arrington 426 Long Block (from 6.1L)

42 x 42 x 48
550.0 lbs
In Stock:


This is THE Arrington 426 HEMI Stroker long block (6.1L edition), the foundation for most of our biggest and best builds. Based on the Chrysler 6.1L HEMI block, all of the moving parts are upgraded and forged to create a high-performance platform for forced induction, aggressive camshaft profiles, and other power add-ons.  

Starting with our 426 short block, we add our custom-engineered high performance cam package and our proprietary ported head and valve package with performance springs and lifters.

Core charges for both the block and heads apply if you are not providing them for upgrade.

3 yr / 36,000 mile warranty


Arrington 426 Forged from Chrysler 6.1L Block

  • 426 Cubic Inch Displacement
  • Bore: 4.080
  • Stroke: 4.080
  • 580 Crank HP (rated)
  • Target Compression Ratio (low): 9.5 : 1
  • Target Compression Ratio (high): 11.0 : 1
  • 3 yr. / 36,000 mile warranty

Short block components:

  • Manley – 4340 Forged Steel Crankshaft
  • Manley – H Beam 4340 Forged Steel Connecting Rods with ARP 2000 Rod Bolts
  • Mahle -- Forged Aluminum Pistons (Arrington spec)
  • High Performance Piston Rings
  • ARP Main Studs
  • Billet Main Bearing Caps (optional)
  • Clevite H Type Main and Rod Bearings

Block inspection and prep:

  • Hot Tank Clean the Block (remove all liquid and contaminants from block & oil galleys)
  • Sonic Check Cylinder Bores
  • Measurement Verifications
  • Borescope Cavities (if required)
  • Validate Deck Surface
  • Validate Bore Centerlines
  • Hone Cylinders w/Honing Plate
  • Line Hone
  • Hand Chase Threads (if required)

Attention to detail:

  • Rotating Assembly
    • Balance Rotating Assembly (we do not depend on factory balance)
    • Micrometer Measurement Of All Bearing Surfaces
    • Hand Match Individual Bearings To Journals For Maximum Tolerances
    • Micro-polish All Bearing Surfaces (including wrist pins)
    • Hand Clearance for Stroker Kit
  • Block
    • Remove All Flashing (chamfer all 90° corners)
    • Radius Bottom Of All Cylinder Bores
    • Arrington-developed Oil System Prep
    • Other Proprietary Block Operations


  • ARP Head Studs
  • Arrington Custom-ported Heads With Valve Matching
  • Melling High Performance Oil Pump
  • Camshaft and Chromoly Pushrods (Arrington spec)
  • Cometic Head Gaskets
  • Mopar OEM non-MDS Lifters