Lotus didn't lift a finger when it came to prepping these 2ZZ-GE Toyota lumps for their Lotus platform. Given the high-performance nature, “adding" lightness and simplicity is an important part of engine preparation.
These block-off plates are CNC machined and made of 3/16" 6061 aluminum. Therefore, they are thick enough and strong enough to tap for threads if needed. There are two block-off plates for the crankcase breather line. This additional breather hose has been proven to not be needed even in the most extreme racing applications. These block off plates are included in all BOE REVolutions Supercharger kits.