Product Summary

LQ4, LQ9, LR4, LS1, LS6, LS mains Main Journal Style

  • Fits GM LS engines 2005 and earlier, 4.000 inch stroke
  • Includes Scat forged steel crank, MAHLE Dished pistons, Scat ProSport H-Beam connecting rods
  • Features choice of 4.005" or 4.030" bore
  • Professionally balanced on state-of-the-art Hines balancer by machinist with over 30 years experience
  • Scat crankshaft features 24-tooth reluctor wheel

Comes as a Kit

Key Specs

MFG. Part #91605154
BrandSpeedway Motors
Connecting Rod TypeH-Beam
Piston StyleDish
Piston MaterialForged Aluminum

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Speedway Motors 91605154 Details

Speedway introduces forged LS rotating assemblies, with balance job. Includes new Scat forged crank with 4 inch stroke, Scat ProSport H-beam connecting rods and MAHLE Dish pistons. Cranks are new so they use standard size bearings.All Scat 4340 cranks internally balanced and feature a 24-tooth reluctor wheel for 2005 and earlier engines.

All balancing is done with our state-of-the-art Hines balancer by race mechanics with over 30 years of experience! A kit purchased with the optional balance job will ship in 24-48 hours. These rotating assembly engine rebuild kits may require additional charges for heavy metal.

Kits feature:

  • Scat 4340 Forged Steel Crankshaft
    • Standard size journals
    • Keyway cut for damper
    • Nitride hardened and shot peened
    • 24-tooth reluctor wheel (2005 & earlier) engines
    • 4.000 inch stroke
  • MAHLE Dish PowerPak Pistons
    • 2618 aluminum alloy construction
    • 4.000" bore pistons available in standard, .005 or .030 sizes
    • C/R 62cc=9.4, 65cc=9.2, 71cc=8.7
    • Piston/Pin Weight: 416g
      Rod Length: 6.125"
  • Scat Pro Sport H-beam Connecting Rods
    • Double rib cap design for added strength and bearing support
    • Polished and shot peened beams to eliminate stress risers
    • Special hollow doweled cap for specific cap-to-rod alignment
    • 6.125" lengths
    • Weight matched set of 8 rods
  • King XP Series Main & Rod Bearings
    • Unique tri-metal structure that is 24% harder than any other conventional tri-metal race bearing
    • Offers 15% - 30% greater load capacity than traditional bearings
    • Features an enhanced tri-metal copper lead construction with nickel barrier
    • The unique SecureBond adhesion process for superior stability between the top and intermediate layers
    • A greater rod bearing height improves bearing-to-bore contact, heat transfer, and reduces spin potential at high RPM
  • GM LS 403 CID: 4.005" bore x 4.000" stroke

Speedway Motors 91605154 Specifications

MFG. Part #91605154
BrandSpeedway Motors
Connecting Rod TypeH-Beam
Piston StyleDish
Piston MaterialForged Aluminum
Main Journal StyleLS mains
Engine Stroke4.000"
Connecting Rod Length6.125"
Connecting Rod MaterialForged 4340 Steel
Connecting Rod Bolt Diameter7/16"
Crankshaft MaterialForged 4340 Steel
Rear Main Seal Style1-piece
Wrist Pin Diameter0.927"
Main Journal Diameter2.559"
Rod Journal Diameter2.100"
Bearing ConstructionTri-metal
Bearing UndersizeStandard
Narrowed BearingYes
Engine BalanceInternal
Harmonic Balancer IncludedNo
Sold in QuantityKit