Improved Racing LS Engine Oil Cooler Bypass Cover — No Sensor Ports, Ported Cavity & FKM Gasket

Improved Racing's Gen III & IV LS engine oil cooler bypass cover replaces the factory cover on small‑block LS pans without an oil cooler, offering a larger internal cavity for improved oil flow and a leak‑resistant seal.

If your GM Gen III or IV LS small‑block has oil cooler ports above the oil filter but no external cooler fitted, this bypass cover provides a direct, OEM‑compatible replacement that reduces internal restriction compared with the diecast OE cover. Machined for fit and supplied with high‑temperature sealing materials and Class 10.9 bolts, it installs in minutes and maintains a clean, durable finish under the vehicle.

How does this bypass cover improve oil flow compared to the original part?

The Improved Racing cover features a large ported internal cavity designed to minimize turbulence and restriction that can occur with the OE diecast bypass. The result is smoother internal oil routing and less pressure drop across the cover.

• Larger internal passages than typical OE diecast covers
• Ported cavity to reduce flow resistance and turbulence
• Precision machining for consistent internal geometry

Will this cover fit my Gen III or IV LS small‑block oil pan?

Yes — it is made to fit most GM Gen III and Gen IV LS‑series small‑block oil pans that have their oil cooler ports positioned above the oil filter. Confirm port location on your pan before ordering to ensure compatibility.

• Compatible with pans where cooler ports sit above the oil filter
• Direct bolt‑on replacement for factory bypass covers
• Check pan port orientation for fit confirmation

What hardware and sealing components are included to prevent leaks?

The cover ships with an aluminum‑bonded, high‑temperature FKM rubber gasket that resists oil and heat, plus Class 10.9 mounting screws to ensure strong, vibration‑resistant clamping. These components together provide a reliable, long‑lasting seal against oil seepage.

• High‑temp FKM rubber gasket bonded to aluminum for durability
• Class 10.9 mounting bolts for corrosion resistance and strength
• Designed for leak‑free fit with proper torque specs

Does this product include sensor ports or extra fittings?

This particular model is the no‑sensor‑ports version and does not provide threaded ports for temperature or pressure sensors. It is intended for vehicles that do not require an in‑line sensor at the bypass cover location.

• No sensor or auxiliary threaded ports included
• Ideal for setups without external oil cooler or sensor needs
• Alternate versions may be available if you need sensor provisions

Who this is for: Owners and builders of GM Gen III/IV LS small‑block engines who either removed an OEM oil cooler or never installed one but still need to seal the factory cooler ports. It suits performance shops, hot‑rod builders, and DIY enthusiasts who want a proven, higher‑flow replacement cover with professional‑grade sealing hardware. Not intended for applications that require sensor mounting at the cover—choose a sensor‑ported variant if you need monitoring or external cooler plumbing.

• Feature: Covers factory oil cooler ports when no cooler is fitted.
• Feature: Larger internal cavity for superior flow compared to OE diecast covers.
• Feature: Fits most Gen III & IV LS small‑block oil pans with ports above the oil filter.
• Feature: Includes aluminum‑bonded high‑temp FKM rubber gasket and Class 10.9 mounting screws.