LT4 377" Short Block
LT4 377" Short Block
LT4 377" Short Block
LT4 377" Short Block
LT4 377" Short Block
LT4 377" Short Block
LT4 377" Short Block
LT4 377" Short Block
LT4 377" Short Block
LT4 377" Short Block
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  • Load image into Gallery viewer, LT4 377" Short Block
  • Load image into Gallery viewer, LT4 377" Short Block
  • Load image into Gallery viewer, LT4 377" Short Block
  • Load image into Gallery viewer, LT4 377" Short Block
  • Load image into Gallery viewer, LT4 377" Short Block
  • Load image into Gallery viewer, LT4 377" Short Block
  • Load image into Gallery viewer, LT4 377" Short Block
  • Load image into Gallery viewer, LT4 377" Short Block
  • Load image into Gallery viewer, LT4 377" Short Block

LT4 377" Short Block

Regular price
$9,000.00
Sale price
$9,000.00
Regular price
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Unit price
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Mesa Balancing Racing Engines  will help you get the most out of your blower or turbo with this short block combo. Proven reliable at 1100hp to the ground, the factory forged LT crank attached to 4340 H-Beam rods and custom forged pistons will set your mind at ease and allow you to make the power with the boost you're craving. 

Displacement: 377" Bore: 4.070"
Proven Power Rating: 1400 RWHP Stroke: 3.620"
Compression Ratio: 10.5:1 w/ 64cc Chamber Rod Length 6.125"
Cylinder Head Compatibility: LT4, LT1 Oil System Type: Dry Sump
Block: GM LT4 6.2L Aluminum
Crankshaft: GM Forged LT4 w/ our Blueprinting Process
Connecting Rods: Callies Ultra Billet H-Beam or Manley Carrillo or Go Racing  w/ARP Ultra 7/16" Bolts
Pistons: Wiseco Forged CP, JE Mahle or Diamond (.300" material above top ring land)
Wrist Pins: Tool Steel Heavy Wall .200"
Ring Pack: NPR Stainless Top (for high heat applications) Napier Second, 3mm Oil
Bearings: Clevite H Series Mains & Rods
Main Studs: ARP 


***CORE EXCHANGE SHIPPING: MBRE is happy to assist you in shipping your block and crankshaft cores to help you save money. Exchanging your block & crank cores helps reduce the overall engine build cost without sacrificing quality. We can have your existing shortblock picked up at a location convenient for you.


MBRE Standard Shortblock Blueprinting Process:

  • Block is fully deburred & inspected for flaws
  • Cylinders diamond honed with torque plates for optimal clearance per application
  • Crankshaft journals indexed & trued to exact tolerance
  • Optimal cylinder geometry achieved with diamond hone and surface finish verified with profilometer
  • Chamfered oil holes for improved oiling to bearings
  • Cylinders machined for rod clearance per application
  • Crankshaft journals polished to 2 Ra or better surface finish
  • Block and components meticulously deburred & cleaned after machining process
  • Crankshaft balanced within ¼ oz-in tolerance
  • All five main bearings & all eight rod bearing clearances measured and adjusted for application
  • Connecting rod housing bores checked & adjusted for optimal roundness & size
  • Ring are precision file fit per application
  • Piston pin bores measured & adjusted for application
  • Cam bearings installed and test cam fitted to ensure smooth rotation
  • Block aline honed and set to low of spec for maximun bearing crush
  • All oil galley plugs and dowel pins installed
  • Deck surfaces machined perpendicular to mains & deck height set for optimal quench
  • Meticulous final assembly of shortblock
  • Cylinders bored (when applicable) on 4 axis CNC perpendicular to mains giving you a true 90o  V8
  • All tolerances, clearances, machining specs, and part numbers are recorded and documented in build sheet