Thru the years, while focusing on winning NHRA Pro Stock events and ultimately a championship, the engine facility also diversified in engine building. A short but successful stint in the World of Outlaws 410 Sprint Car Series occurred in 2016 when Gray Motorsports built two engines to compete in that series. Shane Stewart, driving for Kyle Larson Racing at the time, set fast time in the World Finals in 2016 at The Dirt Track at Charlotte.
While exploring all avenues of engine building in motorsports, the focus on NHRA Pro Stock never wavered. When Tanner Gray took over the driving duties for the in-house NHRA Pro Stock team to begin the 2017 season, the engine shop directed all resources toward that effort. In his rookie season, Tanner delivered five national event wins and became the AAA of Southern California Road to the Future Scholar Award Winner. Gray also became the youngest national event winner in the professional category at the age of seventeen. To build on the success of Gray's rookie season, Gray Motorsports continued developing the NHRA Pro Stock engines. The 2018 season was a success, with Tanner capturing eight NHRA Pro Stock victories and becoming the youngest NHRA World Champion in history.
In 2019, when the Gray's decided to redirect their racing endeavors to the world of stock car racing, the Gray Motorsports engine program began diversifying again. Today, engines are being built for all facets of motorsports. With a heavy concentration in the European Pro Stock class, there is still a link to the 500-inch pro stock engines that have been the focus of the company since its inception. Other engine builds include NASCAR Late Model Stock engines, World of Outlaw Sprint Car engines, and many other types of drag race engines.
Gray Engine Development consists of the most experienced engine builders in the industry. The knowledge retained by this team gives them the necessary advantage to build engines for the customers to be successful on the track.