There are many classes within NHRA's Stock and Super Stock eliminators. Each class is defined by a ratio of vehicle shipping weight and a horsepower factor. The NHRA Stock Car Classification Guide is used to position a vehicle in its proper class.
Below on this page, you will find all years and makes in the NHRA Stock Car Classification Guide. Clicking on a link will allow you to either download the file to your hard drive or to open the file in your spreadsheet program.
On the left side of each Guide, you find the vehicle model descriptions, and across the top are the available engine, identified by cubic inch displacement and original, advertised horsepower rating. At the bottom of each column, you may find another number which represents the NHRA factored horsepower. This is the number used in determining classification (not the advertised), and some engines will have a different factored horsepower for Stock and Super Stock.
The numbers in the middle of the page are the power to weight factors for each model and engine combination, and identify which particular class a vehicle fits into. For instance, if the particular vehicle/engine combination you are looking at has a factor of 8.67 in Stock Eliminator, the vehicle fits in B/Stock, which according to the 2001 NHRA Rulebook, is for vehicles with a power to weight factor of between 8.50 and 8.99 pounds per horsepower.
If you do not find a particular vehicle/engine combination listed in the Guide, it means specifications for that combination were never received from the manufacturer, and the vehicle is not eligible for competition in Stock or Super Stock.
Files can be opened with Excel, or similar spreadsheet program. If you do not have a suitable program, click here to download the Excel viewer.