Here is the dry sump rule from the '72 GCR.
The 1970 rules required the battery to be visible from the engine compartment. Some teams moved the firewall and mounted the battery in the passenger toe board.
In '71, the battery could once again be mounted in the trunk.
in '71 the Penske AMC team mounted their dry sump tank in the "window" in the firewall at the passenger toe board. There are pictures of this. I assume the battery went to the trunk.
I have not found a picture of where the Junk Yard Firebird mounted the tank. A crew member said it was visible on the passenger floor.
My reading of the rules is that the tank needs to be separated from the driver. Hot oil splashing in a wreck or failure would be a bummer...
Anyway, I would love a picture of the JYF dry sump tank circa '72.
My supposition is that teams did not reinvent the wheel for dry sump tanks in '71-they moved the battery to the trunk and used the battery window for
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