Oil Cooler Bypass Cover for Chevrolet GMC LS Gen III IV With 2x1/8 NPT Ports

Block off unused oil cooler ports on your LS engine to prevent leaks and maintain stable oil pressure during operation. This bypass cover drops in as a direct substitute for OE part number 12577903, letting you restore factory sealing without hunting for expensive dealer parts. Machine-milled from 6061-T6 aluminum and finished with a durable black anodized coating, the plate resists corrosive road chemicals and withstands sustained heat cycles. The included FKM rubber gasket provides a robust barrier that tolerates hot automotive fluids and prevents seepage around the oil pan interface.

This design gives you instant customization options right from the first bolt-on. Two integrated 1/8 inch NPT ports allow you to easily mount oil temperature gauges or feed filtered oil to a remote turbocharger setup without drilling new holes. The heavy-duty zinc-plated steel screws hold firm against vibration found in daily driving and track use. For a perfect seal, always wash the oil pan mating surface free of old gasket residue or dirt before installation. Seat the bonded gasket precisely over the bolt guides to maintain alignment. Fasten the four flanged hex head screws gradually using a crisscross pattern to distribute clamp load evenly, ceasing turn once the bolts sit snug to avoid crushing the gasket prematurely.

• Construction Materials: 6061-T6 aluminum plate paired with a 0.06-inch thick FKM rubber gasket.
• Physical Size: 2.70 inches long by 1.10 inches wide and 0.75 inches thick.
• Accessory Ports: Features two 1/8 inch NPT threaded openings for sensors or lines.
• Compatibility: Designed for GM Gen III and Gen IV LS small-block oil pans with cooler port locations above the oil filter.

Package includes: One LS engine oil cooler bypass block-off plate, one pre-bonded FKM rubber gasket, and mounting hardware.

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