LT Cast Iron LTX - Gen V Cast Iron - L8T - 6.6 Truck Block

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  • Regular price $1,750.00
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Factory Mast Introduces Remanufactured L8T Cast Iron Blocks.  The Factory Mast product line ensures only the most premium components and rigorous inspection process, combined with proven Mast quality, and experience.

Introduced in model year 2020 for the GM Silverado HD pick up.  The GM Cast Iron Gen V (LT Series) block promises to deliver on big power potential when paired with the right Mast Motorsports or Factory Mast components.

We hand pick these lightly used blocks and put them through an extensive quality inspection and refurbish program.  All blocks are machined, line honed, and decked to ensure they meet our quality standards.  100% inspected, and pressure tested, before shipping to you.


These blocks have the potential for big power without huge prices.  Uses GEN V- 6.2 Aluminum Cylinder Head. 

Capable of 4.125" (+) stroke, 4.125" (+) bore size.



  • Material - Cast Iron
  • Bore Size - 4.065
  • Deck Height - 9.240
  • Weight - 245 lbs


  • Final Bore & Hone