Ultra 40 Unsleeved Spark Plug Wire Set with 5 in. Straight Pro Boots [Black 8.65mm]

Name: Ultra 40 Unsleeved Spark Plug Wire Set with 5 in. Straight Pro Boots [Black 8.65mm]
Brand: MOROSO
SKU: 710-73839
Price: 167.99 USD
Availability: InStock

^$167⁹⁹

Ships on Nov 02, 2026

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Black

Ultra 40 Unsleeved Spark Plug Wire Set

Universal Fit, Cut to Length

8.65mm Diameter

5 in. Long Straight Pro Boots

Unsleeved

Black

Sold as a Set

Purpose-built race heads put the plugs in places no off-the-shelf wire set was cut for. This universal Ultra 40 set is built to be routed and cut to length for the combination in front of you, with a long 5 in. straight Pro Boot that reaches down into a deep plug well past the header tube.

Moroso 73839 Ultra 40 Spark Plug Wire Set Features:

Universal set intended to be cut and terminated to length.
8.65mm diameter Ultra 40 wire.
5 in. long straight Pro Boot for deep or shrouded plug locations.
Unsleeved construction.
Suits GM Pro Stock, Brodix PB201, CFE, Ford and Yates style cylinder heads.
Black wire.

Strong Spark for Less

Ultra 40 Unsleeved Spark Plug Wires are a cost-effective performance wire without heat sleeving. The wires feature a Kevlar core, four times stronger than other aramid fiber cores, which increases the tensile strength of the wire while reducing its center diameter. That allows for the surrounding insulation to be thicker, resulting in higher dielectric efficiency. With only 40-ohms of resistance per foot, these wires will increase power by bringing more spark to the plug. RFI/EMI resistant to eliminate stereo feedback or ignition interference.

Part TypeIgnition Wire Set

Product LineMoroso Ultra 40 Unsleeved Spark Plug Wire Sets

BrandMOROSO

Package Height3.9

Package Width9.5

Package Length9.5

Weight3.84 PG

Part CategoryPerformance Parts

Diameter (Mm)8.65 mm

SleevedNo

Wire ColorBlack

QuantitySold as a Set