---
product_id: 373719135
title: "GM Gen III & IV LS Billet Rear Galley Plug Barbell Oil Diverter"
brand: "improved racing"
price: "€ 63.19"
currency: EUR
in_stock: true
url: https://www.desertcart.fi/products/373719135-gm-gen-iii-and-iv-ls-billet-rear-galley-plug
store_origin: FI
region: Finland
---

# Threaded M4x0.7 removal hole CNC-machined 6061-T6 aluminum Double Viton O-ring seal GM Gen III & IV LS Billet Rear Galley Plug Barbell Oil Diverter

**Brand:** improved racing
**Price:** € 63.19
**Availability:** ✅ In Stock

## Summary

> 🛠️ Upgrade your LS engine’s heart with precision and power!

## Quick Answers

- **What is this?** GM Gen III & IV LS Billet Rear Galley Plug Barbell Oil Diverter by improved racing
- **How much does it cost?** € 63.19 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/373719135-gm-gen-iii-and-iv-ls-billet-rear-galley-plug)

## Best For

- improved racing enthusiasts

## Why This Product

- Trusted improved racing brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Direct OEM Replacement:** Seamlessly swaps with plastic GM LS Gen III & IV plugs for instant upgrade.
- • **Effortless Maintenance:** Threaded M4x0.7 hole allows quick, tool-friendly removal—because time is money.
- • **Precision CNC Machining:** Billet 6061-T6 aluminum ensures unmatched durability and sleek performance.
- • **Optimized Oil Flow Design:** Smooth fillets and smaller shaft diameter reduce flow restriction, boosting engine efficiency.
- • **Leak-Proof Double O-Ring Seal:** Viton O-rings create a flawless barrier, forcing 100% oil flow through the filter—no dirty oil detours.

## Overview

The GM Gen III & IV LS Billet Rear Galley Plug Barbell Oil Diverter is a precision CNC-machined billet aluminum replacement for the OEM plastic plug. Featuring a double Viton O-ring seal, it eliminates dirty oil bypass, ensuring 100% filtered oil flow. Designed with smooth fillets and a smaller shaft diameter, it optimizes oil circulation while the threaded M4x0.7 hole enables easy removal. Proudly made in the USA, this plug is the ultimate upgrade for GM LS Gen III & IV engines.

## Description

GM Gen III & IV LS Billet Rear Galley Plug Barbell Oil Diverter

## Features

- Improves oil flow and completely eliminates dirty engine oil from bypassing the filter
- Double O-ring design seal positively seals the oil gallery passage
- Direct replacement for plastic OEM barbell plug on GM LS Gen III & IV engines
- Precision CNC-machined from billet 6061-T6 aluminum with Viton O-rings
- Threaded M4x0.7 hole allows for easy removal from engine block
- Made in the USA.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Improved Racing |
| Brand | Improved Racing |
| Package Dimensions | 12.29 x 9.6 x 1.6 cm; 18 g |
| Item model number | EGM-501 |
| Manufacturer Part Number | EGM-501 |
| OEM Part Number | 12573460 |
| Item Weight | 18 g |

## Product Details

- **Brand:** Improved Racing
- **Package information:** Can
- **Vehicle service type:** Gen III and IV GM LS series engines
- **Automotive Fit Type:** Vehicle Specific Fit
- **Manufacturer:** Improved Racing

## Images

![GM Gen III & IV LS Billet Rear Galley Plug Barbell Oil Diverter - Image 1](https://m.media-amazon.com/images/I/41uS83nyh3L.jpg)

## Questions & Answers

**Q: do u need to replace the o-ring in the future?**
A: The O rings would only require replacement if it was removed after the initial installation. If you were removing during engine replacement or rebuilding, we would recommend replacement at that time.

**Q: Will this fit a 2008 gmc Savana 3500 6.0L?**
A: As long as it’s your standard LS block. Be at a 5.3, 5.7, 6.0, 6.2, or even a 7.0 Liter you are good to go. I bought this for my newly built 408 stroker 6 liter iron block and it is far superior to the stock style. I also like that it has a threaded portion in the back to be able to easily take it out if you ever need to, plus it’s double O-ringed.

**Q: Why is this one different than all the others? The barbell is longer on one end.**
A: Take a look at the last photo in the listing, where you can see the barbell installed in the engine. You can see it's designed so the tip fills the entire closed section of the passage. The barbell is only narrow where oil needs to flow around it. This helps create a better seal at the tip and also makes the barbell stronger.

**Q: 2008 chevy silverado 5.3 this will work on my engine**
A: Yes, this will fit all Gen III and IV LS and Vortec family blocks, so it will fit your 5.3

## Frequently Bought Together

- Improved Racing GM Gen III & IV LS Billet Rear Passage Plug Oil Diverter Barbell
- Dorman 635-518 Engine Rear Main Seal Cover Compatible with Select Models
- Camshaft Retainer Plate Gasket Compatible with LS Series Engines, &Bolt Kit ARP 134-1003 Gen III IV V for GM LS1 LS2 LS3 4.8 5.3L 6.0L 6.2L Vortec Corvette Cam

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**Shop now:** [https://www.desertcart.fi/products/373719135-gm-gen-iii-and-iv-ls-billet-rear-galley-plug](https://www.desertcart.fi/products/373719135-gm-gen-iii-and-iv-ls-billet-rear-galley-plug)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-20*