I ran for years on an open rad. I believe the pressure is only 3 lbs, so it really isn't raising the boiling point that much. A proper mix of antifreeze (60/40) will also reduce the chance of boiling over. After all, you will only be driving in parades, not the African desert.
Once things warm up here, I think I might have an extra cap buried in the spare parts pile (but no guarantee)
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