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MTM117-421 - Mast Motorsports Complete LSX 440 HO (640hp), NO ECM or Harness

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

117-421
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Description

The X-Block 440’s heart and soul is the new GM Performance LSX iron block. This X-Block engine family utilizes a Mast Motorsports engineered camshaft that is custom ground on a Mast Motorsports 3 bolt cam core. The 440 foundation is a fully machined iron block with a forged Callies rotating assembly with Mahle pistons that is topped off with Mast Motorsports Black Label LS3 heads and a LS3 intake manifold. ARP fasteners are used throughout and Manley pushrods ride on LS3 hydraulic roller lifters. The X-Block 440 HO is a powerful yet reasonably priced offering by Mast Motorsports.

Type: X-Block 7.2L Displacement: 440 Cubic Inches
Compression Ratio: 11.4:1
Bore x Stroke: 4.185 x 4.000
Rev Limit: 7000 RPM
Crank:Callies Forged
Rods: Callies H-Beam
Pistons: Mahle Motorsports
Cam: Mast Custom 3-Bolt Core Cam
Heads: Mast Black Label LS3 Large Bore
Intake: GM LS3 Intake
Valve Springs: Mast Dual

Engine Components:

  • LSX Iron Block
  • Plateau Honed to 4.185”
  • True Surfaced Deck
  • Engine Block Deburred
  • Blueprinted Short block
  • Clevite Rod and Crank Bearings
  • Callies Forged H-Beam Connecting Rods
  • Custom Mahle Motorsports Pistons
  • Mast Black Label LS3 280cc Heads
  • ARP Head Bolts
  • ARP Main Studs
  • Cometic Head Gaskets
  • Mast Custom Hydraulic Roller Cam
  • GM LS7 Hydraulic Roller Lifters
  • Mast Black Label Pushrods
  • Mast Double Valve Springs
  • Mast Solid Stainless Intake Valves
  • Mast Solid Stainless Exhaust Valves
  • Mast Black Label Titanium Retainers
  • Mast Black Label Locks
  • MAP/IAT Harness
  • Bosch EGO Sensor
  • GM LS3 Intake Manifold
  • GM 90mm DBW Throttle Body
  • Bosch Dead Headed Fuel Rail
  • Bosch LS7 Fuel Injectors
  • Mast 8 Layer Air Filter with IAT Bung
  • Intake Air Temperature Sensor
  • Crankshaft Position Sensor
  • Camshaft Position Sensor
  • Oil Pressure Sensor
  • Oil Temperature Sensor
  • Engine Coolant Temperature
  • Engine Knock Sensors
  • Manifold Air Pressure Sensor
  • Ignition Coils
  • Spark Plugs
  • Plug Wires
  • GM Foot Pedal
  • GM Starter li>GM Oil Filter
  • Mobil 1 Synthetic Oil
  • Engine Break in Oil Additive
  • Choice of F-Body, Y-Body, or Truck Water Pump Balancer, and Oil Pan

    Runs on Premium 91-93 Octane
  • Application List

    Universal

    Shipping Information

    • Item Requires Shipping
    • 500.0 lbs.
    • FREE 48 State Shipping

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