TULSA, Okla.—A shakeup in the finish of the JST Motorsports A-Class feature event, Frank Flud was declared the winner after post-race tech revealed the engine and parts in the transmission to be illegal in the No. 4y driven by California’s Jett Yantis.
Issues discovered in post-race tech included:
Illegal head work, with bowl porting over a quarter-inch past the valve seats…