Earl's Performance GM LS/LT Oil Cooler Block Off Plates

Earl's Performance GM LS/LT Oil Cooler Block Off Plates provide a clean, professional solution for eliminating the factory oil cooler system on GM LS and Gen V LT engine platforms. Purpose-built for engine swaps, race builds, and high-performance applications where the OEM oil cooler is not being utilized, these precision-engineered billet aluminum covers go well beyond a basic delete plate — offering functional auxiliary port options that make them a genuinely versatile upgrade.

What sets these plates apart from plain block-off covers is the top-mounted auxiliary port, a thoughtful engineering detail that provides critical exhaust header clearance in tight engine bay configurations. Depending on the variant selected, port configurations are available to accommodate an oil pressure gauge, a turbocharger oil supply line, or an OEM-style factory sensor — supporting a wide range of build requirements without the need for additional adapters.

Every plate in this lineup ships complete with an included O-ring seal, eliminating the need for a separate gasket and ensuring a leak-free installation straight from the box. All necessary mounting hardware is also included for a complete, straightforward installation.

Key Features:

• Precision CNC-machined billet aluminum construction for lasting strength and durability
• Top-mounted auxiliary port designed for maximum exhaust header clearance
• Multiple port configurations available across variants — NPT and OE metric thread options to suit a variety of build needs
• O-ring seal included — no separate gasket required
• Complete with all necessary mounting hardware
• Compatible with GM LS and Gen V LT engine platforms
• Made in the USA

About Earl's Performance: Earl's Performance Plumbing pioneered the use of aviation-grade fluid transfer technology in the automotive performance market and has been a trusted name in professional racing for over five decades. As part of the Holley family of brands, Earl's continues to deliver precision-engineered plumbing components built to perform under the most demanding conditions.