Guessing this plug is a leak filler in this 906 head that I've had since the 70's but I'm not gonna' remove it to find out.....
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Did you go all of the way through with the drill?View attachment 1716493625
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The top picture is a pin hole that opened up when I charged the cooling system.
Brand new intake manifold.
The bottom picture is my fix.
I was going to pull the intake and run it up on the hill so @MOPARMAGA could TIG it.
Then I said screw that and fixed it with a plug.
Just crap **** any more. It cost me at least two hours to unscrew that.
Holley can suck it.
Is there a reason you're keeping the intake make and model a secret?Yup. It’s not leaking so I wouldn’t even look at it knowing my luck.
It would think I was side eyeing it and it would start leaking just to irritate me.
I’m not poking that bear.