GM LS Conversion/Dual-Pass Radiator Kit for 1955-1959 Chevy Pickup Truck, Suburban 3.8/4.3/4.6/5.3/5.7L
InfoVehicle Info Needed
CHAMPION COOLING SYSTEMSPART NUMBER: 166-5559-LSK

GM LS Conversion/Dual-Pass Radiator Kit for 1955-1959 Chevy Pickup Truck, Suburban 3.8/4.3/4.6/5.3/5.7L

$65935
8 left in stock
ShippingShips Today
Lowest PriceLowest Price Guarantee

Items You Need

16705 Service Pro Antifreeze Concentrate [1 gallon]

GLOCKNER OIL

16705 Service Pro Antifreeze Concentrate [1 gallon]

Part Number : 708-16705
$1999
No Spill Coolant Filling Funnel Kit [15-Piece]

JEGS

No Spill Coolant Filling Funnel Kit [15-Piece]

Part Number : 555-51220
$1999$23.29
You Save$3.30
Racing Super Coolant Additive [16 oz.]

JEGS

Racing Super Coolant Additive [16 oz.]

Part Number : 555-72324
$1199$13.89
You Save$1.90
Racing Coolant and Antifreeze with LP-3 [1 Gallon]

JEGS

Racing Coolant and Antifreeze with LP-3 [1 Gallon]

Part Number : 555-72316
$2526$36.99
You Save$11.73

GM Truck
GM LS Conversion/Dual-Pass Radiator
  • 1955-1959 Chevy Pickup Truck, Suburban 3.8/4.3/4.6/5.3/5.7L
  • Includes:
    • Champion Core 3-Row Radiator
    • Fan Shroud
    • 16 in. Electric Fan
    • Fan Wiring Harness and Relay

      Champion Cooling 5559-LSK Kit Includes:

      • (1) Champion Cooling GM LS Conversion/Dual-Pass Radiator - CC5559-LS
      • (1) Champion Cooling Aluminum Single Fan Shroud - FS5559
      • (1) JEGS 16 in. Universal HD Electric Reversible Cooling Fan - 52110
      • (1) JEGS Single Electric Fan Wiring Harness and Relay Kit - 10560
    • Stay Cool with Champion Core LS-Swap Radiators

      Champion Cooling Systems Dual-Pass Radiators are a perfect choice for your LS-engine conversion vehicle. Available for most popular LS swap applications, these radiators are constructed entirely of aluminum for exceptional weight savings over stock equipment. The dual-pass flow offers superior cooling capabilities by flowing the coolant twice across the radiator. All radiators feature a 3-row core of 5/8 in. tubing to ensure proper flow when needed most. Champion Radiators are built with 100% welded seams, brazed core technology, and absolutely no epoxy. These radiators work great for both street or race cars and support approximately 600 to 800+ horsepower cooling capacity.

      Show More

      Upgrade your engine cooling system with the Champion Cooling Systems LS-Engine Conversion Aluminum Radiator — built for performance and reliability. Ideal for any modern swap, this high-quality radiator is purpose-designed for your LS engine application and ensures long-lasting thermal control without compromise.

      Crafted from full aluminum construction, it brings exceptional weight savings and superior heat-dissipation compared to traditional cast-iron or mixed-material units. With a true three-row core and dual-pass flow design, this radiator allows coolant to traverse the cooling medium twice for maximum efficiency under load. Whether you’re building a street cruiser or a high-powered track warrior, this unit supports 600 to 800+ horsepower setups with confidence.

      If you’re working on an ls swap radiator setup, this Champion solution ticks all the boxes: direct-fit for many LS-based conversions, high-capacity flow, and robust build quality. The all-aluminum assembly incorporates TIG-welded tanks, brazed core technology (0 % epoxy), and premium internals to resist warping, corrosion, or failure under elevated heat.

      We know how important it is to get your cooling right when performing an ls swap radiators upgrade. This radiator simplifies fitment, delivers industry-leading performance, and leaves nothing to chance. Choose the Champion Cooling Systems LS-Engine Conversion Aluminum Radiator and get the cooling support your build deserves — because when temperatures rise and demands increase, the right radiator makes all the difference.

    Part TypeRadiator
    Product LineChampion Cooling Systems LS-Engine Conversion Aluminum Radiators
    BrandCHAMPION COOLING SYSTEMS
    Overall Thickness3.125 in (79.4 mm)
    Overall Height26.125 in.
    Wiring IncludedYes
    Radiator Cap IncludedYes
    Shroud MaterialAluminum
    Outlet Quantity1
    Inlet LocationUpper passenger side
    Inlet Size (In.)1.25
    Core Width21.625 in (549.275 mm)
    Cooler Fitting Size1/2 in.-20 Straight Thread, Inverted Flare
    Row Quantity3
    Overall Width26.875 in.
    Tube Size0.375 in (9.5 mm)
    Radiator FinishPolished
    Inlet Quantity1
    Transmission CoolerYes
    Maximum Fan Cfm2,200 cfm
    Shroud ColorNatural
    Bracket MaterialAluminum
    Radiator StyleDownflow
    Outlet Size1.5 in (38.1 mm)
    Fan Quantity1
    Radiator MaterialAluminum
    Drain Valve IncludedYes
    Air Conditioning Relay IncludedYes
    QuantitySold as a kit
    Mounting TypeBracket
    Inlet AttachmentHose
    Core Height19.375 in (492.125 mm)
    Core Thickness2.25 in (57.15 mm)
    Fan Diameter16 in (406.4 mm)
    Blade ColorBlack
    Outlet LocationLower passenger side
    Outlet AttachmentHose
    Fan IncludedYes
    Part FitmentDirect Fit
    Bracket FinishPolished
    Package Qty1
    Package TypeEA
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning