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Removing broken bolt from back of head... 200

Here's what I would do. Yank the head, no big task at all, one major gasket, and a waterpump o-ring. That will allow you to repair this thing properly, without standing on your head and worrying for the next five years.

It is just a gallery plug so drill it out and tap it for 5/16 fine or whatever oversize you need, and loctite a bolt with a copper washer into it. Before doing that, remove the plug from the front of the head, and blow compressed air right through it. That will remove any debris garanteed.

By the way, the oil temp you would have measured had this worked out in the first place would have been the temperature of the head itself, and not the oil. Oil temp can only be taken from the fluid itself, so as suggested a fitting in the side of the pan, immersed in oil, or the stock and exposed drain plug type.

Don't even think about JB Weld. Fix it properly.






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