LT1/LT4 377" 1000HP Short Block

Available Qty: 1

$9,750.00

Starting with a tried and true GM LT4 crankshaft we will balance the rotating assembly to spec, after this, we open up the bores to 4.070" and fill the block with custom forged Mahle pistons that feature strutted pin bosses, thick top ring land, and coated skirts. Next, we connect the two using 6.125" Callies Compstar H-beam rods and .200" wall heavy-duty wrist pins. This proven combo will support 4 digit horsepower numbers in your LT powered ride while retaining the factory piston oil squirters.

Displacement: 377" Bore: 4.070"
Proven Power Rating: 1000 HP Stroke: 3.622"
Compression Ratio: 10.5:1 w/ 64cc Chamber Rod Length 6.125"
Cylinder Head Compatibility: LT4, LT1 Oil System Type: Wet

Block: GM LT4 6.2L Aluminum
Crankshaft: GM LT4
Connecting Rods: Callies Compstar Rods
Pistons: Mahle Forged With Upgraded Pins
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: LME 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. 

 

LME 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