History When were first reversed 30/31 model a firewalls for engine clearance?

How early did guys start reversing firewalls on their 30/31 Model A's? I'm imagining it was shortly after the ohv olds and cad's came out. Anyone have any early photos?

 

Probably as soon as people started putting the wrong engine in a model A. There is a legit argument for making more room for a flathead in a model A. But even if there were not another popular engine in prewar and war era model As was the 6 cylinder Chevrolet. So I would imagine later '30s or earlier '40s.

 

When the first guy tried to shoehorn a Caddy in a Model A. HRP

 

Anyone have any early pictures?

 

Just the ones I took when I was "writing the book" on the A V8 in the mid '30s.

 

I've always heard that was the "old school" way but I can't remember ever seeing it in old pictures.