Competition Rotating Assembly Kit [GM LS Series 403 ci]
InfoVehicle Info Needed
SCATPART NUMBER: 942-1-43806BI

Competition Rotating Assembly Kit [GM LS Series 403 ci]

$2,40799
ShippingShips on 11/19/2026
Lowest PriceLowest Price Guarantee

58 Tooth Reluctor
Rotating Assembly Competition Kit
  • GM LS Series 403 ci
  • 58-Tooth Reluctor
  • 4.005 in. Bore Mahle Forged Flat Top Pistons
  • 4.000 in. Stroke Forged Crankshaft
  • 6.125 in. Length Forged H-Beam Rods
  • Rated for 1,000 HP
  • Balanced

    Crankshaft

    • 4340 forged street crank
    • Shot peened, heat treated, precision ground, ion-nitrided
    • Throws lightened
    • Lightening holes in all rod journals
    • Large radius on all journals
    • Gun drilled mains
    • Straight shot and chamfered oil holes

    Connecting Rods

    • 4340 forged H-beam
    • Bushed wrist pin
    • 7/16 in. ARP 8740 cap screws

    Pistons

    • Mahle
    • 2618 forged aluminum
    • Flat top -4 cc volume
    • Compression ratio: 62 cc - 12.1 ; 65 cc - 11.7 ; 71 cc - 10.9
    • Coated
    • Low drag rings w/ductile iron top ring

    Bearings

    • H-Series Main and Rod bearings
    • Racing Performance & Durability!

      Scat Competition Rotating Assemblies for GM's popular LS Series engines feature matched components that high-performance race engines that produce up to a staggering 1,000 horsepower. These kits were put together using a forged crankshaft, forged H-beam connecting rods, premium forged aluminum Mahle pistons, Clevite H-Series bearings, and Hastings steel top rings to make for one durable package. When you need to put together the ultimate short-block for race use, look no further than a Scat Competition Rotating Assembly Kit. 

    Part TypeEngine Rotating Assembly Kit
    Product LineScat GM LS Series Competition Rotating Assemblies
    BrandSCAT
    Part CategoryPerformance Parts
    Part FitmentSemi Universal
    Vendor Part Number1-43806BI
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews

    Items You Need

    Heavy-Duty Piston Installation Tool [Nylon Composite, White]

    PROFORM

    Heavy-Duty Piston Installation Tool [Nylon Composite, White]

    Part Number : 778-67571
    $5174$68.99
    You Save$17.25
    Engine Assembly Lube [4 oz. Bottle]

    JEGS

    Engine Assembly Lube [4 oz. Bottle]

    Part Number : 555-28000
    $599$6.99
    You Save$1.00
    Engine Stand [1000 lb. Capacity]

    JEGS

    Engine Stand [1000 lb. Capacity]

    Part Number : 555-80040
    $9999$109.99
    You Save$10.00

    REPLACEMENT PARTS

    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning
    Your Cart

    Your shopping cart is empty!