All Cars Welcome

Your Race to the NASA 25 Hours of Ozarks starts here!!

This T+6+5 endurance race will start you on the right track to the 25 or simply be fun endurance race for your team!

We’ll have a full test day and a night practice.

6 Classes

HYC — (Hypercar)

Fastest class, no limits on modifications. NASA Super Unlimited rules apply.

PLE — (Prototype Lite Endurance)

Same rules as HYC. Vehicles are restricted to having less than 2.5 liters displacement naturally aspirated, or 1.3 liters with forced induction.

GTE — (Grand Touring Endurance)

Uses NASA Super Touring GT rules. Unlimited modifications for GT style cars.

STE — (Super Touring Endurance)

Uses NASA Super Touring 2 rules.

TC1 —  (Touring Car 1)

Uses NASA Super Touring 4 rules.

TC2 — (Touring Car 2)

Uses NASA Super Touring 5 rules.

NASA 25 Hours Event Page

NASA 25 Hour Rules Apply
2026 NASA Endurance Rules