CNRAQR LS Engine Oil Cooler Bypass Cover Block Off Plate for Gen III/IV LS — OE 12577903 Replacement
- £34.45
- £34.45
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Description
xOverview
The CNRAQR LS Engine Oil Cooler Bypass Cover is engineered for GM Gen III and Gen IV LS-series small block oil pans where the oil cooler ports sit above the filter. It serves as an upgraded replacement for OE GM part 12577903, offering a clean, bolt-on solution for enthusiasts who bypass or remove the oil cooler in compatible builds. The unit is compact yet robust, designed for a tidy installation that maintains a factory-like appearance while delivering dependable function in everyday driving or track-ready setups.
Materials and Design
Machined from billet 6061-T6 aluminum and finished in durable black anodize, the bypass cover combines strength with corrosion resistance. The design features a large ported internal cavity and smooth edges to support steady flow characteristics when compared to typical factory die-cast covers. While it does not alter engine specifications, its geometry aims to provide a cleaner oil path under varying speeds and conditions. The included gasket, using high-temperature FKM rubber bonded to aluminum, helps sustain a reliable seal through heat cycles and oil exposure.
What You Get
- 2 LS engine oil cooler bypass covers
- 4 zinc-plated mounting screws
- 4 plugs
- 2 upgraded gaskets
Key Benefits in Real-World Use
- Broad compatibility with GM Gen III/IV LS oil pans with oil cooler ports above the filter
- Solid billet aluminum construction for a durable, long-lasting component
- Ported internal cavity designed to support smoother flow characteristics
- Complete hardware kit included to simplify installation and reduce extra purchases
Installation and Care
Installation is straightforward: position the block-off plate over the oil pan, align with the ports, insert the gasket, and tighten the screws. Clean the mating surfaces, avoid overtightening, and inspect for leaks after the initial startup. The package is designed to deliver a secure, leak-free seal under typical operating conditions.
Support and Policy
CNRAQR offers a two-month return service. If you have questions during installation or use, contact us for prompt assistance.
FAQ
Q: What is the CNRAQR LS Engine Oil Cooler Bypass Cover used for?
A: This bypass cover blocks the oil cooler ports on GM Gen III/IV LS engines, replacing OE GM part 12577903.
Q: What comes in the package?
A: The kit includes 2 bypass covers, 4 screws, 4 plugs, and 2 upgraded gaskets.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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