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, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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