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

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Product Description

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.

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

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 the USA

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

Why Replace the Factory Oil Passage Plug?

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)

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.

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