Altered Class

Altered

Cars built to 1969 NHRA, AHRA rules allowed.

Altered

All vehicles must meet NHRA tech to run.

Left-hand steer and Roadsters allowed.

Seat Belts must be up-to-date.

Trans-shields or blankets and/or blow proof bellhousings must be employed.  

Wings Allowed.

Wheelie bars allowed.

Engine:

Blown, injected and/or carbs allowed.

Any fuel allowed.

Super Chargers: GMC/Roots-type, 8:71 max displacement. No modern Paxton or Vortec 

Fuel Injection: Mechanical fuel injection only—no electronic fuel injection.

No turbo

No nitrous

Single distributor or magneto systems only.

MSD-type or other electronic ignition allowed.

Rev-limiter allowed, but for engine protection only; may not be used on launch

No electronic delay boxes, light timers, throttle controls or anything of that nature.

Cast aluminum or iron intakes only. No sheet metal intakes.

Vintage-style U-Fab tube intakes allowed

Aftermarket heads and blocks allowed.

 Any transmission allowed

Trans brake allowed,

Rev Limiter allowed on Launch.

Altered Class

1/8-mile/ Pro .400 tree

Indexes

4.50

4.75

5.00

5.25

5.50

5.75

6.00

6.25

6.50

6.75

7.00

7.25

7.50

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