Pinging/Vapor Lock?

I run the 12s at 180 plus psi.
and 207*F minimum cooling temp.
I used to run underhood air.
It didn't seem to be a problem for the chambers.
But getting a decent consistent performance on underhood air was not possible, so I finally clenched and puckered, then made a fresh-air hole.
There are of course other ways to get fresh air to the carb.

But um, up here in Manitoba, the air temp rarely exceeds maybe 37*C, and when it does, it's usually just for a few days in July and only rarely are they all in a row.
37C is about 99*F, if my convertor is right.