The Circuit Classes

The Circuit Classes and Rules

Racers will be able to change classes on Friday ONLY and must do so, in person, before submitting their timeslips.

2 time slips from each day required. Turn in time slips to The Circuit registration table EACH DAY!

Champion and Runner-Up Trophies for Each Class (You VS You Awards 1-2-3)

Quarter Mile Classes

The Circuit 2025 Class Rules

Drag Strip Rules

All Classes are .400 Pro Tree

If running Hard Tire, lanes will open 2 hours prior to track close

All Hard Tires to run out of the Groove (Straddle the sticky parts)

New Classes for 2026

Overdrive

The Circuit 2026!
We are excited to announce the Fling family will be running the lanes at The Circuit 2025 presented by Summit Racing!
With this addition, we are changing a few things:
We will run in Groups by ET, similar to the style of the National Level events.
Based on historical data, we are planning to split into three run groups.
Group A will be 11.49 and Quicker cars on Slicks or Radials.
Group B will be 11.50 and slower cars on Slicks or Radials.
Hard Tire cars will be called first for the Open Run.
We will be using a punch card and you will only be allowed TWO passes during your Group Calls.
**WE WILL call up the other Group if the lanes are slow before the time is up (except for Hard Tire).
The current run schedule looks like this:
Friday: Group A 10-12, Group B 12-2, Open 2-Lanes Close or 4pm (with Hard Tire First)
Saturday: Group B 10-12, Group A 12-2, Open 2-Lanes Close or 4pm (with Hard Tire First)
Sunday: Group A 10-12, Group B 12-2, Open 2-Lanes Close or 4pm (with Hard Tires First)

Classes

Quarter Mile Classes

**Street Race Power Adder – 315/60-15 or smaller Radial (29×10.5 Non-W Slick or smaller), 8.500 ¼ Mile ET or Slower, Big Block or Small Block engine, Any Power Adder, Must be Stock Appearing body

**All Motor Small Block – engine displacement must be 430 ci and below, and the engine may not be a Mopar 426-based Hemi, a Chrysler early Hemi, a big-block Mopar, a big-block Chevy, a big-block Ford, or an FE Ford. – Same as HRDW except Open to any size slick or drag radial. –

** All Motor Big Block – engine displacement must be 431 ci and above. All Mopar 426-based Hemis, Chrysler early Hemis, big-block Mopars, big-block Chevys, big-block Fords, and FE Fords will run in Big-Block classes regardless of displacement. Same as HRDW except Open to any size slick or drag radial.

**Gasser/Hot Rod – Vehicles pre1972 – No Muscle Cars unless solid axle swap or lifted front suspension (Gasser appearance), Single Power Adder, No Beadlocks, No Wheelie Bars, Must Fit Class Appearance – Class is Combined for 2025+ (unless 6 cars each NA and PA are present at Registration)

**Stick Shift – Must use manual H-Pattern transmission, Shifts must be made by the driver with a mechanical lever, no air shifters allowed. Clutch must be activated by a pedal by the driver. Lenco-type planetary transmissions prohibited.

**Overdrive by Padgett Performance

Any Tire, Any Power Adder, Must have Overdrive Transmission. GearVendors style overdrive not allowed.

You VS You

**10.000+ ET – Class is about consistency, no matter your ET.

Class Standings determined by Margin of Difference in Driver’s Quickest and Slowest Time Slips. Example: Day 1 ET1: 12.345 ET2: 12.286, Day 2 ET1: 12.555 ET2: 12.401, Day 3 ET1: 12.307 ET2: 12.493 – Quickest ET: 12.286 – Slowest ET: 12.555 = Difference of 0.269

Any Tire, Any Event Legal Car

**11.00 Index – Follows RMRW rules (except tire)

Any size tire – Must be stock appearing – Lexan windows are not allowed (unless backglass of truck for down bars) – Must have a dash, front seats, carpet, and door panels

**12.00 Index – Follows RMRW rules (except tire)

Any size tire – Must be stock appearing – Lexan windows are not allowed (unless backglass of truck for down bars) – Must have a dash, front seats, carpet, and door panels

** Motorcycle – Traditional motorcycle or trike with single front wheel. Slingshot type vehicles will race in appropriate vehicle classes.

Eighth Mile Classes

**Small Tire – 315 radials/ 29×10.5 (Non-W) permitted

– Imports running a 4 cylinder or smaller 28×10.5W tire is permitted

– All 6 cylinder, 4 cylinder and rotary engines can have dual power adders. V8 engines are limited to ONE power adder.

– The car must retain its original appearance, profiles, and dimensions. Aftermarket fiberglass and/or carbon fiber replacement panels are allowed. All body panels must be factory style. Aftermarket wings and spoilers are permitted. Forward facing hood scoops/turbo or supercharger inlets are permitted. No complete carbon fiber or fiber glass aftermarket bodies.

Top 4 Shootout on Sunday. Passes can count towards your Overall Average if you choose.

**6.50 Index – No passes quicker than 6.50 to be submitted. Racer closest to 6.500 Event Average wins class.

**Tailgate

– vehicle with bed and tailgate only (El Camino/Ranchos allowed)

-no SUVs or wagons

-back half allowed

-2wd any tire

-4wd 10.5 tire max width

-any single power adder

-any fuel

– radial or slick only

2 passes per day