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Mast Motorsports LSR - Concept Performance Aluminum Block
Mast Motorsports LSR - Concept Performance Aluminum Block
Mast Motorsports engine block LSR - Concept Performance Aluminum Bare Block
Mast Motorsports engine block LSR - Concept Performance Aluminum Bare Block
Mast Motorsports engine block LSR - Concept Performance Aluminum Bare Block
Mast Motorsports engine block LSR - Concept Performance Aluminum Bare Block
$ 4,295.00

LSR - Concept Performance Aluminum Bare Block

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Only left in stock

LSR Block Features

1,500(+) HP Capable

  • 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
  • Billet 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
  • Solid Fill - No Water Jacket - Full Send Maximum Powa'

Standard Deck Options

  • Standard Deck - Single Cross Bolt                   PN LSR-SD1X
  • Standard Deck - Dual Cross Bolt                     PN LSR-SD2X
  • Standard Deck SOLID FILL                             PN LSR-FMJ-SD2X

Tall Deck Options (All Dual Main Cross Bolts)

  • Tall Deck - STD Cam Height                            PN LSR-TD2X
  • Tall Deck - Raised Cam Height                        PN LSR-TD2XRC
  • Tall Deck SOLID FILL - Standard Cam Height PN LSR-FMJ-TD2X
  • Tall Deck SOLID FILL - Raised Cam Height     PN LSR-FMJ-TD2XRC