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Bob
You did not crack the head. My guess is that at some point the head froze with water in it. There is a plastic impregnation process that may be able to salvage the head. The casting is put in a pressurized vat of molten plastic to seal the crack if it is not too large. This process is used at foundries to salvage castings with air holes. I used to work at a place that had this process, but they are out of business. We impregnated the air to air refueling probes for jet fighters and cast aluminum wheels for General Motors among other parts. I will try to find the name of the process and a location that still does it.
Dave Fillman
45 MB
---- you wrote:
I noticed a hairline crack from number three spark plug
> recess (the crack doesn't extend all the way to the threads) to about an
> inch to the right of the temperature sender threads.
> 1). Did I crack the damn thing? What do
> you all think?
>
> Thank you all in advance,
>
> Bob K.
> '42 GPW
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