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Mast Motorsports Short Blocks Big Power 427 Aluminum Assembled LSR Short Block
Mast Motorsports Short Blocks Big Power 427 Aluminum Assembled LSR Short Block
Mast Motorsports Short Blocks Big Power 427 Aluminum Assembled LSR Short Block
Mast Motorsports Short Blocks Big Power 427 Aluminum Assembled LSR Short Block
Mast Motorsports Short Blocks Big Power 427 Aluminum Assembled LSR Short Block
Mast Motorsports Short Blocks Big Power 427 Aluminum Assembled LSR Short Block
Mast Motorsports engine block 427 Cubic Inch Big Power Aluminum Short Blocks -LSR - Concept Performance
$ 14,500.00

Big Power 427 Aluminum Assembled LSR Short Block

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Only left in stock

1,500 HP Capable

Choose a premium LSR short block assembled and proven by Mast Motorsports.  Assembled with MADE in the USA parts
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Choose Either:

427 Cubic Inch

  • LSR Standard Deck Block
  • ARP Hardware
  • Callies Magnum Crank
  • Callies Ultra Rods
  • 4.125 Bore
  • 4.000 Stroke
  • 6.125 Rod Length
  • Compression Height 1.105
  • Wiseco Premium Coated Piston

LSR Block Features


  • 100% Made in USA
  • 356 T6 Premium Aluminum
  • Spun Ductile Iron Sleeves
  • Cross Braced Lifter Valley with Individual Drain Backs
  • 40% larger Main Cap Surface with a Double Crossbolt Option
  • Short or Tall deck blocks feature a Heavy Duty 0.750" deck thickness
  • Added Stock to the Front and Rear Valley Walls
  • Added 7th Transmission Bolt Hole to Accept Early Style GM Transmission
  • Maximized Cranksaddle Radius​
  • Front Oil Feed Line Can Be Restricted for Mechanical Lifter Options
  • 6 Bolt Cylinder Head Pattern
  • All OEM LSX parts such as covers, pans and accessories work seemlessly with the LSR

 

LSR Block Specs

  • Standard Deck:  9.240"
  • Tall Deck: 9.720
  • Bore Range: 4.065-4.190
  • Weight: 113lbs w/main caps

 

 LSR Block Options

  • ARP Main Stud Options
  • Cam Bore Can Be Machined to Accept 60mm Roller Bearings
  • Lifter Bore can accept larger bore or key way style lifter
  • Double Cross Bolt Option- Increases to 8 Bolt Main