LS Engine Block-Off Adapter

The LS Engine Block-Off Adapter by DERALE is a precision-engineered component designed for LS engine builds that require port sealing without permanent modifications. Whether you're running a carbureted LS, retrofitting older cooling systems, or consolidating ancillary ports during a stroker assembly, this adapter eliminates vacuum leaks and maintains system integrity. Mechanics and enthusiasts rely on block-off adapters when original port configurations don't align with modern fuel injection systems, supercharger kits, or custom cooling loops.

Engineered from cast aluminum, the LS Engine Block-Off Adapter features precise OEM-style port matching that ensures zero fitment issues on standard LS1, LS2, LS3, and LS9 cylinder heads. The adapter's compact 2.5 x 1.5 x 4 inch footprint integrates seamlessly into tight engine bay configurations, while its minimal weight of 0.02 lbs ensures no impact on vehicle dynamics or balance. This component prevents vacuum system faults that can trigger check engine lights and compromise idle quality—a critical consideration when tuning standalone ECUs or carbureted setups where every port seal matters.

This adapter is essential for LS engine swaps, track-focused builds, and restoration projects where OEM cooling or emission ports require blocking. Installation requires no modifications to the block and integrates with factory gasket surfaces, making it ideal for both bolt-on projects and full engine refreshes. Fuel-injected and carbureted LS applications benefit equally from proper port sealing—neglecting this detail often results in vacuum leaks that degrade driveability and prevent proper fuel mapping on modern engine management systems.