Sold out

Ls237-(58X4X)-Engine-Main-Harness-Extended-Length

Click to zoom in

Load image into Gallery viewer, Ls237-(58X4X)-Engine-Main-Harness-Extended-Length

Holley 558-134 LS2/3/7+ (58x/4x) Engine Main Harness Extended Length

Name: Holley 558-134 LS2/3/7+ (58x/4x) Engine Main Harness Extended Length
Brand: Holley
Price: 979.99 CAD
Availability: OutOfStock

by Holley

• SKU: ds_BBVL_558-134

• Product Type: Engine Wiring Harness

2 sold in last 8 days

$979.99

Inventory:

Guaranteed Fitment

Always the correct part

Added Value

Performance matched parts

In-House Experts

We know our products

Nationwide Delivery

Economy shipping

1 customers are viewing this product

Holley 558-134 LS2/3/7+ (58x/4x) Engine Main Harness Extended Length

Rock Solid Hitch

Solid hitch with serious strength and clean powder coat, heavy to lift, but installs easy and tows perfectly!!

Great Shipping

Shipping was quick and on time - exactly what I needed for my small-block build - would buy again for sure

Perfect Fit Mats

Weatherbeater mats fit my work truck perfectly. Dropped them in and nothing moves. Truly a great upgrade

Sleek Visors

Window visors look incredible and feel durable, install was simple. Zero wind noise on the highway!

Leveling Success

Leveling kit components were well packed. Instructions lacking, but online videos helped. Rides level now and feels planted.

Found Single Lifters

Found single lifter pairs in stock here when others required full sets, fast shipping got me racing again, hell yeah!!

Desert Series Bumper

Rear bumper upgrade looks better than factory plastic. Install was easy, and functionality is miles ahead. Highly recommended.

Lomax Fitment

Tonneau cover fit is excellent. Clear instructions and a smooth install. Delivery to my door was super convenient

Next Day Turbo

Turbo arrived next morning and matched description. Bolted up cleanly and truck is back to full power.

Legend Grille Guard

Husband’s birthday grille guard is rock solid, looks sharp he loves it so much!!! Thanks again

Shipping Protection Helped

Customer service handled a damaged shipment immediately. Refund was painless. I’ll shop here again.

Easy Exhaust Install

Exhaust system installed in two hours on my first try. Perfect fit and the sound is pure joy.

Do you offer wholesale or jobber pricing?

Yes. Wholesale pricing is available for legitimate businesses that provide a valid business number or equivalent proof. Ongoing purchase volume is required to maintain discount eligibility. One-time personal buyers aren’t eligible.

Will this part fit my vehicle?

If a product page clearly lists fitment for your vehicle and the description leaves no reasonable doubt, we’ll cover the cost of return if it doesn’t fit. Exclusions apply if prior modifications cause the issue. When browsing self-serve, you’re responsible for confirming compatibility by checking manufacturer fitment data and notes. If unsure, contact us before ordering and we’ll verify it for you.

Do you offer technical support or installation advice?

We help where possible on a case-by-case basis. Most manufacturers include detailed instructions and tech support contacts. Because our catalog spans hundreds of brands, we can’t provide every torque spec or procedure, but we’ll connect you with the manufacturer if needed.

Do you offer price matching?

We don’t guarantee price matching, but we’re happy to review a legitimate in-stock offer from another Canadian retailer. The comparison must include all costs such as product price, shipping, taxes, and fees, and the item must be identical and available for immediate purchase. We won’t lose money to match unsustainable or out-of-stock pricing.

Can I exchange an item?

Yes. In-store exchanges happen on the spot when stock is available. For shipped orders, the original item must be returned first. Once received and inspected, we can issue a store credit toward the correct part or replacement. We can’t send a second item while the first is still in your possession without payment for both.

Are prices shown before or after tax?

All prices on the site are before tax. GST, HST, or PST is calculated at checkout based on your shipping address..

Need Help? We've Got Answers.

Find quick solutions to the most common questions about shipping, returns, compatibility, and support.

Contact

Description_DEF	Engine Wiring Harness
Description_DES	LS2/3/7+ (58x/4x) Engine Main Harness Extended Length
Description_EXT	Holley EFI LS Main Harness; For Use w/58X Crank 1997-2012 LS Engines; Plug And Play; Extended Length;
Description_INV	EXTENDED LENGTH 58X LS MAIN HARNESS
Description_FAB	Plug And Play With Dominator/Hp/Terminator X And Terminator X Max ECUs
Description_FAB	Designed For Use On 24x/1x And 58x/4x LS Engines
Description_FAB	22 in. Longer Than Previous Harnesses
Description_FAB	Relay Breakout Is Also Moved Back From 19 in. To 43 in. From The ECU Connector
Description_FAB	Extended Length Allows You To Mount The ECU In A Wide Variety Of Locations
Description_MKT	These harnesses are designed to fit most 24x and 58x LS engines, from 1997-2012. They are a perfect fit for installers wanting to mount the any Holley EFI ECU inside of the passenger compartment where it is away from the elements, and easy to access.
Description_SHO	EngWiringHarness
Description_KEY	58x;
Product Type	LS Main Engine Harness
WARNING CA Proposition 65	Yes
WARNING CA Proposition 65 Message	WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Crank Reluctor	58x
Harness Application	LSX
Warning	California Proposition 65
Brand	Holley EFI
Emission Code	3
Harness Type	Main
Length	5.0000
Width	14.0000
Height	15.0000
Weight	6.0000