Welcome to the IHRA Rules Page Here you can view the IHRA Rulebooks, and check out all of the latest competition updates and revisions. Pro Top Fuel Funny Car Outlaw Pro Modified Pro Modified Pro Nitrous Pro Stock (500 Inch) Mountain Motor Pro Stock Top Alcohol Dragster Top Alcohol Funny Car Pro-Am Top Dragster Top Sportsman Factory Stock Quick Rod Super Rod Hot Rod Super Stock Super Stock Indexes Stock Eliminator Stock Eliminator Indexes General E.T. Bracket Jr. Dragster Teen 📋 🗓️ May 15, 2025 📄 29 Revision: MASTER: Age 12 to 17; Rack & pinion steering and steel brake lines are mandatory. ET 7.90 or slower 🗓️ June 12, 2025 Super Rod Added left hand steer roadsters to reserved for. Top Fuel Deletion of "dry sump oiling" from engine block specs. 🗓️ June 22, 2025 📄 50 General Correction: "All drivers running 0-9.99 (6.49 1/8th mile)..." to "All drivers running 0-9.99 (6.39 1/8th mile)..." 🗓️ July 2, 2025 📄 1 Top Sportsman Change: Page 1: Minimum dial to 6.00 seconds. Addition: Directly below the line that reads (Maximum dial-in 7.70 seconds) "Any laps faster than 5.950 seconds - that run will be thrown out." 🗓️ July 2, 2025 📄 1 Top Alcohol Funny Car Correction: "Max 91.5% nitro (rear gear ratio 3.19 or lower)" 🗓️ July 17, 2025 Hot Rod Removal: "Exhaust - Must not exceed 95 decibels at 50 feet (measured at 3,500 RPM, no load). • Sound suppression not mandatory if within noise limits." 🗓️ August 13, 2025 Pro Nitrous Various boost pressure changes.