Factory Stock Showdown (FSS) (in the NHRA), or Pro Stock (in the IHRA) is a class of drag racing designed to showcase the Chevrolet COPO Camaro, Dodge Challenger Drag Pak, and the Ford Mustang Cobra Jet.
FSS continues to be a fan favorite with growing popularity over the last ten years. The popularity of this class of racing is in large part due to the recognizable cars. All three of the types of cars that race in the FSS are standard monocoque chassis cars that are body in white from the factory with all drag racing running gear installed at the factory, using production chassis of the cars on the road.
While cars competing in FSS are of the same type you see on the road, they do have numerous safety enhancements and rules that are required to be eligible to run in FSS events. Cars are limited to 9" wide tires, must have full safety cages, independent fuel cells, weight limits and other general racing safety requirements. These safety enhancements are in place to allow these cars to run the 1/4 mile at speeds no faster than 7.50 seconds. Since its inception the FSS class has gone faster every year and the NHRA has put restrictions in place to ensure safety and parity between the cars
Drivers competing in the NHRA Factory Stock Showdown Series earn championships points at each of the NHRA National events at which they compete. The points are accumulated throughout the year, and an annual champion is crowned at the conclusion of the season.
While the NHRA FSS is the original and preeminent racing series for Factory Stock cars the growth and popularity of FSS racing has been seen through expansion in other series. These include the National Muscle Car Association's (NMCA) Factory Super Car series and Drag Illustrated's Factory Stock Classic as examples. In 2026, the International Hot Rod Association eliminated the traditional 500 cubic inch formula for Pro Stock in favour of using the "Pro Stock" moniker for Factory Stock Showdown cars.
History
2012 The FSS class was started with a single event at the US Nationals.
Winner - Bo Butner
2013 FSS expanded to three events.
2014 FSS Expanded to four events.
2016 The School of Automotive Machinists and Technology (SAM Tech) became the series sponsor.
2017 SAM Tech NHRA Factory Stock Showdown added a fifth event.
Champion - David Barton
2018 Expanded to a seven-race series with a 16-car qualifying field.
Champion - Lean Pruett
2019 Expanded to and eight event schedule.
Champion - Drew Skillman
2020 Champion - Aaron Stanfield
2021 In 2021 Constant Aviation became the title sponsor and introduced the Factory Stock Showdown Bounty prize. The Bounty prize is a $1000 bounty that is put on the winner of the previous event. Whomever eliminates the holder of the Bounty at the next event earns the bonus. If the same driver wins the next event than the Bounty is rolled forward until it is awarded.
Champion - Aaron Stanfield
2022 Champion - David Barton
2023 In 2023 Flexjet will be the title sponsor and the series will be expanded from 8 to 10 races
Champion - Aaron Stanfield
2024 The schedule is reduced back to eight races. Mark Pawuk became the first Stellantis champion since 2017.
Champion - Mark Pawuk
2025
Champion - Mark Pawuk
2026 The series expands to a ninth round in the championship season, for a total of 9 of 20 rounds. However, because of weather issues, one round was abandoned (Martin, Michigan) and replaced with a doubleheader round in Madison, Illinois
2026 Flexjet NHRA Factory Stock Showdown Schedule. +DateEventLocationMarch 5-8Amalie Motor Oil NHRA GatornationalsGainesville Raceway, Gainesville, FlApril 24-26NHRA Four-Wide NationalszMAX Dragway, Charlotte, NCMay 14-17Gerber Collision & Glass Route 66 NHRA Nationals presented by PEAKRoute 66 Raceway, Chicago, ILJune 12-14Super Grip NHRA Thunder Valley NationalsBristol Dragway, Bristol, Tenn.June 25-28Summit Racing Equipment NHRA NationalsSummit Motorsports Park, Norwalk, OhioSept. 2-7Cornwell Quality Tools NHRA U.S. NationalsLucas Oil Indianapolis Raceway Park, IndianapolisOct. 2-4NAPA Auto Parts Midwest Nationals DoubleheaderWorld Wide Technology Raceway, Madison, IllinoisOct. 12–1438th annual Texas NHRA FallNationalsTexas Motorplex, Ennis, Texas
References