LSR - Concept Performance Aluminum Bare Block

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