The ORIGINAL Lightweight Steel LS Swap Block® Engine: Gen III LS, Gen IV LS Years: 1997-2020 Our patent-pending swap block uses our unique tab-and-slot design to provide accurate mounting positions of engine accessories and bolt-ons. This distinctive design is lightweight and comes disassembled for ease of shipping and storage. Precision formed returns on all weight-bearing components and tight tolerance slots create a rigid and accurate representation of the LS engine block compared to bolt-together types. One tool accomplishes accurate placement of a GM LS engine into the chassis build of your choice. Easily positioned by hand, the days of slinging an engine on a crane in and out of your build are over. It's designed to bolt to your transmission while also permitting the attachment of oil pan, motor mounts, headers, water pump and intake. Save time and money and work more safely. Durable steel construction resists heat from welding, so unlike foam blocks, custom motor mounts can be fabricated right on the block. Comes with hardware for exhaust, motor mounts, bellhousing, oil pan, and water pump. Download Assembly Instructions here. Our video and written assembly instructions describe how to assemble the LS version of our Swap Block Engine Mock Up Block. Assembly with our patent-pending tab and slot system is the same for our engine and transmission Swap Blocks. { "@context": "https://schema.org/", "@type": "Product", "name": "LS Mock Up Swap Block | Gen II or Gen IV", "description": "LS MockUp Swap Block for a Gen III LS or Gen IV LS engine from 1997-2020. It's the ORIGINAL lightweight steel swap block to mock-up accessories and bolt-ons.", "review": { "@type": "Review", "reviewRating": { "@type": "Rating", "ratingValue": "5", "bestRating": "5" }, "author": { "@type": "Organization", "name": "G Force Performance Products" } }, "aggregateRating": { "@type": "AggregateRating", "ratingValue": "5", "reviewCount": "35" } }