UMI’s solid engine mounts provide maximum vehicle performance by replacing the factory rubber motor mounts. These mounts bolt directly to the frame of the 1973-1992 Camaro/Firebird and 1978-1988 GM G-Body, as well as many other 1974 and up GM V8 SBC applications. They are designed to decrease engine movement and are required to be used with factory block mount clamshells or UMI’s P/N 90058 clamshells. Note that solid mounts do not work with Oldsmobile V8 style clamshells. Crafted with pride in Philipsburg, PA, USA. These solid engine mounts are CNC laser cut from 3/16” thick mild steel and come with a durable black powder coat finish. They are designed to match factory specifications and are made in the USA.