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

4.9 4.9 out of 5 stars 376 ratings
$29.90
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Purchase options and add-ons

  • 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.
› See more product details

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Product Description

Barbell in rendering

Improved Racing designed this billet aluminum rear passage plug (commonly known as the "barbell") to improve oil flow and completely eliminate dirty engine oil from bypassing the filter.

  • Improved Racing's barbell features a second O-ring that completely seals off the dirty oil from the clean oil, forcing 100% of oil flow through the filter.
  • Sharp corners were avoided and machined as smooth fillets to improve oil flow, while the bullnose tip helps smooth oil flow to the oil filter.
  • The shaft diameter is smaller than the OEM plastic barbell to minimize flow restriction. A threaded hole was added to the end of the plug so that it can be easily removed with any M4x0.7 screw.
  • Because it's machined from aluminum, the plug will never degrade. Simply replace the two O-rings with any rebuild.

Barbell in rendering

Barbell in rendering

Barbell

Precision CNC-machined from billet 6061-T6 aluminum

Second O-ring completely seals the dirty side of the rear galley from the clean side, preventing dirty oil from flowing to the engine bearings

Features and surface finish designed to reduce fluid restriction

Barbell in rendering

Includes:

  • 1 x CNC-machined billet aluminum rear oil passage plug "barbell"
  • 2 x AS568 Dash Number 111 Size FKM (Viton) O-rings
  • Installation Manual

Applications

  • All General Motors Gen III and IV LS series Engines & Vortec engines

Made in America

Made in the USA

This product, and many other Improved Racing products, are made in the USA.

Why Replace the Factory Oil Passage Plug?

Improved Barbell and OEM

  • The factory oil passage plug (shown on the left) is made from plastic, which degrades over time, compromising the seal. Simply replacing the O-ring is not enough. It is therefore recommended that the entire plug be replaced with every engine build.
  • The factory plug does not seal the passage perfectly due to manufacturing tolerances and cost. It's simply not possible to make a plug that will fit perfectly in every engine bore, and still allow for removal, because the bore itself has a manufacturing tolerance (+/- 0.005", for example).
  • The ridges on the front of the OEM plastic unit are an attempt to make the plastic more malleable so it deforms into the hole, creating a better seal. In practice, it doesn't seal very well, and the plastic degrades over time, allowing oil to flow around it.
  • Adding an O-ring to the end of the plug creates a positive seal that can account for tolerances and completely prevent any oil from bypassing the filter.
  • Improved Racing's passage plug is reusable, lifetime part. It can be reused over and over with every engine build by simply replacing the O-rings.

Specifications

Primary Material 6061-T6 aluminum
Plug Material CNC-Machined 6061-T6 Billet Aluminum, M4 x 0.7 Thread
O-ring Material FKM (Viton Rubber), 75A
Maximum Operating Temperature 400°F (204°C)
Minimum Operating Temperature -22°F (-30°C)

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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

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

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What's in the box

  • 1 x CNC-machined billet aluminum rear oil galley plug "barbell" with 2 x AS568 Dash Number 111 Size FKM (Viton) O-rings

    • Looking for specific info?

    Customer reviews

    4.9 out of 5 stars
    4.9 out of 5
    376 global ratings

    Customers say

    Customers like the fit and quality of the auto oil filter. They mention that the o-rings fit snug in the bore and installation was very easy. They also appreciate the solid product and the quality machine work.

    AI-generated from the text of customer reviews

    19 customers mention19 positive0 negative

    Customers are satisfied with the quality of the auto oil filter. They mention that it is a solid product made of good quality materials. Some say that the double o-ring keeps the unfiltered lube where it is. Overall, most are happy with their purchase and recommend it to others.

    "...repairing a rear main replacing the OEM plastic for this nicely machined aluminum component." Read more

    "Looks good quality but I have not installed it yet. I forgot to when I had my engine out 🫤..." Read more

    "Quality machine work and good quality o rings. Would recommend and use again" Read more

    "Fit perfect, no issues" Read more

    10 customers mention10 positive0 negative

    Customers are satisfied with the fit of the auto oil filter. They mention that the o-rings fit snugly in the bore and installation was easy with a bit of lubrication.

    "...The o-rings fit snug in the bore and installation was very easy a bit of lubrication on the o-rings and push it into the bore...." Read more

    "I cant say enough how perfect this thing is, fit perfect!" Read more

    "Fit perfect, no issues" Read more

    "...Not the case with this product, fit perfectly in my gen 4 5.3." Read more

    3 customers mention3 positive0 negative

    Customers find the installation process of the auto oil filter to be easy. They mention that it's a perfect fit for their 5.3 LC9 engine and that no modification is needed.

    "...The o-rings fit snug in the bore and installation was very easy a bit of lubrication on the o-rings and push it into the bore...." Read more

    "Perfect fit for 5.3 LC9. No modification needed." Read more

    "Great product, no modifications needed..." Read more

    Nice product
    5 Stars
    Nice product
    Doesn't work on the Gen V LT 5.3 there longer , I was so pissed , but my bad.
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    Top reviews from the United States

    Amazon Customer
    5.0 out of 5 stars Easy to install and provision to service
    Reviewed in the United States on October 16, 2023
    Verified Purchase
    I the forward thinking of the tread to make service in the future possible. I would think anytime the pickup tube o-ring for oil pump needs replaced this would be serviced as well. The o-rings fit snug in the bore and installation was very easy a bit of lubrication on the o-rings and push it into the bore. I would highly recommend this to anyone that is already repairing a rear main replacing the OEM plastic for this nicely machined aluminum component.
    One person found this helpful
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    Stephen
    5.0 out of 5 stars Nice product
    Reviewed in the United States on April 20, 2024
    Verified Purchase
    Doesn't work on the Gen V LT 5.3 there longer , I was so pissed , but my bad.
    Customer image
    Stephen
    5.0 out of 5 stars Nice product
    Reviewed in the United States on April 20, 2024
    Doesn't work on the Gen V LT 5.3 there longer , I was so pissed , but my bad.
    Images in this review
    Customer image
    Customer image
    Helpful
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    thomas pepitone
    5.0 out of 5 stars 5.3 rear main barbell
    Reviewed in the United States on April 9, 2024
    Verified Purchase
    I cant say enough how perfect this thing is, fit perfect!
    Helpful
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    Safwan hassan
    5.0 out of 5 stars Looks good quality
    Reviewed in the United States on April 10, 2024
    Verified Purchase
    Looks good quality but I have not installed it yet. I forgot to when I had my engine out 🫤
    Helpful
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    Devon
    5.0 out of 5 stars Quality product
    Reviewed in the United States on January 5, 2024
    Verified Purchase
    Quality machine work and good quality o rings. Would recommend and use again
    Helpful
     Report
    Amazon Customer
    5.0 out of 5 stars 6.2 LS
    Reviewed in the United States on November 16, 2023
    Verified Purchase
    Fit perfect, no issues
    Helpful
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    Brendan Corr
    5.0 out of 5 stars don’t fall for cheaper knock offs
    Reviewed in the United States on October 9, 2023
    Verified Purchase
    this barbel went straight into my 230k mile lq4 with no issues. all the other barbels i looked at had tons of reviews stating fitment issues. this is not one of them. this is a high quality machined part with the dual O-Rings
    3 people found this helpful
    Helpful
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    Anthony O.
    5.0 out of 5 stars Fits 5.3/.6.0 gen 3 and 4
    Reviewed in the United States on October 2, 2023
    Verified Purchase
    Heard of other brands not fitting or needing sanding to fit? Not the case with this product, fit perfectly in my gen 4 5.3.
    Helpful
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    Top reviews from other countries

    Chris Bradbrooke
    5.0 out of 5 stars Pricey
    Reviewed in Canada on January 30, 2022
    Verified Purchase
    Exactly as described. Not made "overseas"
    Looks like a quality product
    Report