firewall crease

[modelapickup31]

The first time I noticed it I thought I would have to repair it because it just didn't look right. After looking at other firewalls I see its supposed to be there. Does anyone know if it was a afterthought from production or know anything about it?
Geoff

[Mitch//pa]

its for rigidity, strengthens it and prevents oil canning

[DadOfTwo]

Mitch, I bow to your experience, but just for clarification... When I first read the OP I thought he was talking about the formed ridges. And I think that is what you are referring to in your reply.

However, on second look, I think he is talking about the horizontal crease that runs all the way across the firewall.

This novice thinks that, too, is normal, where top half meets bottom half, but will excuse myself now and let the experts continue...

[modelapickup31]

Correct, I was trying to show the horizontal line that goes across the whole firewall. The other ridges all make sense to me and look planned. I'm sure Mitch is correct as well. Thought it may have been a remedy due to fit of the cowl on the later firewalls.
Geoff

[Mitch//pa]

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Originally Posted by DadOfTwo

Mitch, I bow to your experience, but just for clarification... When I first read the OP I thought he was talking about the formed ridges. And I think that is what you are referring to in your reply.

However, on second look, I think he is talking about the horizontal crease that runs all the way across the firewall.

This novice thinks that, too, is normal, where top half meets bottom half, but will excuse myself now and let the experts continue...

thankyou