Put a bolt in it. If you felt air coming out of the bolt hole, then by all means, plug that bad boy up with a new bolt!!
I am wondering HOW you are getting air out of the bolt hole as both pairs of heads I have here have blind holes in that location. Maybe the casting is different or something.
Regardless, that is definitely an issue!
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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