LME 427" LSR 1500HP Short Block

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

LME does the LSR right. Precision machine work coupled with the highest quality components is what makes this baby shine. The LSR block from Performance Concepts takes all the best features of the proven GM LSX and wraps it into an all aluminum body. With features like: priority main oiling, doweled billet main caps, 6 bolts per cylinder & thicker deck, the LSR is a player on and off the track. (Shipping covers delivery to most areas but is subject to change

Displacement: 427" Bore: 4.125"
Proven Power Rating: 1500+ RWHP Stroke: 4.000"
Compression Ratio: 10:1  Rod Length 6.125"
Cylinder Head Compatibility: Any LS Configuration Oil System Type: Dry or Wet Sump

Block: LSR Cast Aluminum
Crankshaft: Callies DragonSlayer w/ LME Blueprinting Process
Connecting Rods: Callies Ultra Billet H-Beam w/ ARP Ultra 7/16" Bolts
Pistons: Diamond Custom Forged FI  w/ Lateral 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 Rods and Mains w/ Grooved Thrust, Dura-Bond One Piece Cam Bearings
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