I had the same issue and I reversed the two bolts, put a dab of silicone under the head which sealed the leak. I believe the leak path was through the threads between the nut and bolt.

Let it dry first 24 hours before refilling with antifreeze.


Here is the post where I discovered and resolved the issue.


Phil
Moderator, The Engine Shop, Interiors and Project Journals

1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
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