Track OrderOrder Status & ReturnsHelpGift CardsHelpHelp CenterPhone1-800-345-4545
Shop by Category

Most Popular

Restoration

Shop All Categories

Shop New ProductsShop ALL BrandsTech ArticlesDeals
MY ACCOUNT
Order Status & Returns
CONTACT USHELP CENTER
Logo
Cart0
$000
Made in USA
73743 Ultra 40 Red 8.5mm Spark Plug Wire Set for GM Gen III/IV LS, Gen V LT Engines w/o Aluminum Heat Shield (11 in.)
InfoVehicle Info Needed
MOROSOPART NUMBER: 710-73743

73743 Ultra 40 Red 8.5mm Spark Plug Wire Set for GM Gen III/IV LS, Gen V LT Engines w/o Aluminum Heat Shield (11 in.)

$6899
ShippingShips on Nov 02, 2026
Lowest PriceLowest Price Guarantee
Best Value
Save
$600
Made in USA
8.5 mm Ultra Pow'r 11 in. Truck Spark Plug Wires for GM Gen III/IV LS, Gen V LT Engines [Red]

555-40242

8.5 mm Ultra Pow'r 11 in. Truck Spark Plug Wires for GM Gen III/IV LS, Gen V LT Engines [Red]

$6299

Red
Ultra 40 Spark Plug Wire Set
  • GM Gen III/IV LS, Gen V LT Engines
  • 8.5mm Diameter Silicone
  • Spiral-Wound Conductor
  • 40 ohms of Resistance per Foot
  • Unsleeved
  • Length: 11 in.
  • Fully Assembled
  • Red
  • Set of 8

    Moroso 73743 Ultra 40 Red 8.5mm Spark Plug Wire Set Note:

    • These 11-in. length wires are recommended for most LS-based truck engines equipped with round coils
    • For most GM LS & LT car or truck engines equipped with square coils, Moroso recommends 9.750 in. wire set 73741 (sold separately)

      • 8.5mm Ignition Wires for GM Coil-Near-Plug Engines

      Moroso 8.5mm Ultra 40 Spark Plug Wire Sets for GM LS/LT Engines have only 40 ohms of resistance for a powerful and efficient spark.

    Part TypeSpark Plug Wire
    Product LineMoroso 8.5mm Ultra 40 Spark Plug Wire Sets for GM LS/LT Engines
    BrandMOROSO
    Package Height3.75
    Package Width9.25
    Package Length11 in (279.4 mm)
    Weight1.75 PG
    Spark Plug Wire Resistance40 ohms/ft.
    Spark Plug Wire Diameter (Mm)8.5
    SleevedNo
    Wire SeriesUltra 40
    Wire ColorRed
    QuantitySet of 8
    AssembledYes
    Package Qty1
    Package TypeEA

    Items You Need

    Dielectric Grease, 8 oz. Brush Top Bottle

    JEGS

    Dielectric Grease, 8 oz. Brush Top Bottle

    Part Number : 555-28021
    $1899$20.99
    You Save$2.00
    Spark Plug Socket Set, 3/8 in. Drive [SAE/Metric 5-Piece]

    JEGS

    Spark Plug Socket Set, 3/8 in. Drive [SAE/Metric 5-Piece]

    Part Number : 555-80509
    $1799$20.99
    You Save$3.00
    3/8 in. Drive 5/8 in. Extended Spark Plug Socket

    JEGS

    3/8 in. Drive 5/8 in. Extended Spark Plug Socket

    Part Number : 555-W80533
    $1399$16.99
    You Save$3.00
    Spark Plug Thread Chaser 14mm and 18mm

    JEGS

    Spark Plug Thread Chaser 14mm and 18mm

    Part Number : 555-80507
    $949$10.99
    You Save$1.50
    Spark Plug Install & Removal Tool

    JEGS

    Spark Plug Install & Removal Tool

    Part Number : 555-W80534
    $1999$22.99
    You Save$3.00
    Inline Ignition Spark Tester

    JEGS

    Inline Ignition Spark Tester

    Part Number : 555-W86554
    $499$5.99
    You Save$1.00
    Flat Seat Spark Plug Index Washers 14mm

    JEGS

    Flat Seat Spark Plug Index Washers 14mm

    Part Number : 555-40355
    $2809$30.59
    You Save$2.50
    Spark Plug Gauge & Gap Tool

    JEGS

    Spark Plug Gauge & Gap Tool

    Part Number : 555-W162C
    $499$5.99
    You Save$1.00

    ITEM YOU MAY ALSO CONSIDER

    8.5 mm Ultra Pow'r 11 in. Truck Spark Plug Wires for GM Gen III/IV LS, Gen V LT Engines [Red]

    JEGS

    8.5 mm Ultra Pow'r 11 in. Truck Spark Plug Wires for GM Gen III/IV LS, Gen V LT Engines [Red]

    Part Number : 555-40242
    $6299$69.99
    You Save$7.00
    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!