Our patent-pending tab-and-slot version of the mock up block provides accurate mounting positions of engine accessories and bolt-ons. Precision formed returns on all weight-bearing components and tight tolerance slots create a rigid and accurate representation of the GM Mark IV, V, and VI BBC engine block compared to bolt-together types. Easily positioned by hand, the days of slinging an engine on a crane in and out of your build are over.? One tool accomplishes accurate placement of a Big Block Chevy engine into the chassis build of your choice.
