1. Allowed Engine Modifications
Components (internal and external) may be modified or replaced, other than the following restrictions:

A. Engines must be derived from production automobiles. Motorcycle, snowmobile, marine or other engines of non-automobile design are not permitted.

B. The engine orientation and the general engine bay location must not be changed from OE. (E.g., Vehicles with transverse engines may only install an engine in a transverse orientation, vehicles with longitudinal engines may only install an engine in a longitudinal orientation, front-engine stays front-engine, rear/mid-engine stays rear/mid-engine.)