LME LT1/LT4 427 Short Block

Late Model Engines (LME)
Current Stock:
Drop-Ships Directly from Manufacturer (4-6 Week Lead Time)

Custom Darton sleeves are the basis to this combination. If your looking to bring the LT platform to the next level that this is your bottom end. Utilizing the rotating assembly out of the the proven 416" this short packs a punch with the added bore size. Sure to take full advantage of your free flowing heads. (Shipping covers delivery to most areas but is subject to change

Displacement: 427" Bore: 4.125"
Proven Power Rating: 1400 RWHP Stroke: 4.000"
Compression Ratio: 10.5:1 w/ 64cc Chamber Rod Length 6.125"
Cylinder Head Compatibility: LT4, LT1 Oil System Type: Dry or Wet Sump

Block: GM LT4 6.2L Aluminum
Crankshaft: Callies 4340 Magnum w/ LME Blueprinting Process
Connecting Rods: Callies Ultra Billet H-Beam w/ARP Ultra 7/16" Bolts
Pistons: Diamond Forged FI w/Gas Ports (.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 Main & Rods
Main Studs: ARP 

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