Could they race without stating rules by having local racers understanding tech would be per what ever the tech man thought and his thoughts would be to follow a specific series or sanctioning bodies rules?
It's local racing and what does it matter if rules are stated or not so long as those racing "locally" know what the thoughts of the tech man will follow?
Totally spirit and intent will either pass or fail you if teched.
And those who race sort of under the table know exactly where to go to read the "spirit and intent" rules.
The track or any track would never have to publicly state or write any rules so long as "local" racers know how they will be teched.