This adaptor set allows the installation of LS engines into models using a standard 3-bolt motor mount. These adjustable mounts position the engine in either the original location 1 forward or 2 forward to allow for transmission bellhousing cleara nce. Each mounting location is positioned to allow proper driveline alignment. For greater positioning flexibility each position allows an additional 1/2 of adjustment. Set includes engine mounting plates adjuster plates hardware and instruc tions. Note: Some aftermarket motor mounts may require mounting holes enlarged to 7/16. Some OEM style mounts may require additional clearance of the cast rubber portion to allow full front to back adjustment of the adapter. Not for use with clamshell type mounts. 1947-72 GM Cars and Trucks – LS Engine Mount Adaptor Set. All content on this website is copyrighted. No part of this website, including text, photos, or illustrations may be copied without the prior written permission of Classic Industries®.