Head vent mod for trapped air

ufo-lowI really DO need a bigger hammer!

I'm looking for the specs, or a drawing, for doing this mod on the Ford iron heads. The head is drilled and tapped on the end for a pipe thread fitting. This taps into the water jacket, and allows air trapped in the head to escape. The placement of the hole is critical. I remember seeing this mod detailed, but can't find it now. Any help appreciated - thanks.

1/27/177:37 PM

Original Post

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