At the seven School of Automotive Machinists & Technology NHRA Factory Stock Showdown events to be held in 2018, competitors will qualify and compete in their own separate eliminator from Stock. Fields at all events will be expanded to (16) cars. Those not qualifying will not be permitted to run in the Stock eliminator as in past years.

The School of Automotive Machinists & Technology NHRA Factory Stock Showdown qualifiers will be competing for the NHRA Wally trophy, event champion’s jacket and an event purse. Factory Showdown qualifiers will not receive Lucas Oil Stock Eliminator national championship points.

Additional Showdown Rules are listed below:

 Designation: FS/XX

 .5 Pro Tree

 Minimum weight for 2.3L Eaton supercharger combinations 3,300 lbs.

 Minimum weight for all other combinations 3,550 lbs.

 Permitted Combinations:

Reserved for 2008 and newer Chevrolet COPO, Dodge Drag Pak, and Ford Cobra Jet with the following factory production engine of the same make. Year of engine optional. Only those engines and/or bodies listed are eligible for the Factory Stock Showdown.

2014-2015 Camaro COPO 350

 530 HP Supercharged Whipple

2016-2018 Camaro COPO 350

 580 HP Supercharged Whipple

2017-2018 Camaro COPO 350

 590 HP Supercharged Whipple

2015 Challenger Drag Pak 354

 530 HP Supercharged Whipple

 540 HP Supercharged Whipple

2008 Mustang Cobra Jet 330

 425 HP Supercharged Eaton

2010 Mustang Cobra Jet 330

 435 HP Supercharged Eaton

2012 Mustang Cobra Jet 330

 450 HP Supercharged Eaton

2013 Mustang Cobra Jet 302

 500 HP Supercharged Whipple

2014 Mustang Cobra Jet 302

 525 HP Supercharged Whipple

 560 HP Supercharged Whipple

2016 Mustang Cobra Jet 302

 565 HP Supercharged Whipple

 575 HP Supercharged Whipple