Fresh Rebuild Coolant in Exhaust/Exhaust in Coolant - Cracked Head?

[digger]

i think the first reply still stands.

[TobyB]

All I can add-

Get it hot and try pressurizing #6 at TDC compression. (basically, do a hot leakdown test)

My not- very- clever vote would be a crack somewhere which
only opens up when hot.

Is the head corroded?

I once put together an M10 that had corrosion in a water jacket that breached into a head bolt hole,
and only did it hot. Eventually, it left a trail on top of the head where coolant escaped from under the washer.

If you can't find anything else, yes, I'd try a different head. Especially if the gasket seal this time looks good as well.

Pictures always help, too, as sometimes a picture sees in ways eyes don't...

t

[zaq123]

tried this thing (link) into your expansion tank lid? if, no try it. -25 inHg of vacuum will find your crack or wherever the coolant ig going.

https://www.harborfreight.com/coolin...kit-64985.html

2 min test vacuum test with this endoscope into your spark plug holes

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

[e30austin]

you should post some pictures of your cylinder head. top side with emphasis on the cam line, and the mating surface.