LME 427" LSX 2500HP Short Block

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

This short block is the heart of the proven combination that gives you 2000+ horsepower at your disposal. The solid foundation starts with your choice of blocks; the vigorous LS-Next from Dart or direct from GM, the mighty LSX. Both feature remarkable improvements to the oiling system and cast with exceptional materials. Handling the top end are provisions for 6-bolt head configuration with option to upgrade to 1/2" studs, this recourse makes cylinder head gasket and head lift issues a thing of the past. LMEs custom forged 4.125" piston from Wiseco is designed to handle the astounding heat and cylinder pressures today's boosted street machines produce. Callies Dragonslayer crank with a 4.000" stroke, 6.125" Ultra rods, and .200" wall heavy duty pins conclude the proven rotating construction making this the ultimate base for street car dominance.  (Shipping covers delivery to most areas but is subject to change

Displacement: 427" Bore: 4.125"
Proven Power Rating: 2000+RWHP Stroke: 4.000"
Compression Ratio: 9.5-1.5:1 Rod Length 6.125"
Cylinder Head Compatibility: Any LS Configuration Oil System Type: Wet Sup or Dry Sump

Block: GM LSX
Crankshaft: Callies EN30B Billet 8 Counterweight w/ LME Blueprinting Process
Connecting Rods: Dyres 300M Billet H-Beam w/ ARP 7/16" "D" Bolt
Pistons: Diamond Custom Forged FI  w/Gas Ports (.300" material above top ring land)
Wrist Pins: TP1 Tool Steel Heavy Wall .210"
Ring Pack: Total Seal AP Stainless Top (for high heat applications) AP Stainless 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