air injection ports

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737jetdr

FABO Gold Member
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Whats the most common way to plug the air injection ports on the smog 318 heads? I saw a thread on here once that listed sizes of plugs and such but cant seem to locate it. Thanks
 
Drill and tap a 1/4 X 20 allen stud.

LOL, I've seen tin foil stuffed in there and JB Weld, both also worked.
 
The holes are .25", I drilled the first .375" deep out to .31 (5/16) and welded them up....then grinded the weld back flush!..talk about cheap, and fast.
 
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