Exhaust Block Off Plates LS Engines

The Exhaust Block Off Plates LS Engines from ALLSTAR PERFORMANCE are precision-engineered aluminum components designed to seal unused exhaust ports on GM LS-series engine blocks. These plates are ideal for anyone building a dedicated race engine, installing a carbureted LS in a classic car, or performing a complete engine bay overhaul.

Constructed from lightweight aluminum and finished in natural (unpainted) form, these one-piece block-off plates bolt directly to the exhaust port mounting surfaces on LS cylinder heads. Their design effectively prevents unwanted air infiltration and vacuum leaks that can degrade idle quality and fuel economy, making them a crucial addition for serious engine builders.

LS engine builders, whether working with LQ4, LS2, LS3, or other variants, will find these block-off plates essential. They provide a clean, professional solution that enhances the quality of engine builds, ensuring that critical details are not overlooked during the assembly process.