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I know it's been a while, but I finally got around to pulling the engine. When I pulled the intake, I looked down the head on the #8 cylinder and could see coolant sitting on top of the valve. Dogdays was right. How does coolant get on top of the valve? Must be a crack? I pulled the head and found the exhaust valve on that cylinder is clean compared to all others, I assume this is from the coolant cleaning it.

So do I have the head checked for cracks? Is it worth putting any money into iron 906 heads for a street car?

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Try to find a machine shop that can pressure check that head to find the crack, it might be fixable, maybe not. I would pull the #8 piston out and look real hard at it, especially the top and 2nd ringlands, look for corrosion, wear and damage to the piston including a collapsed skirt As far as replacing one 906 head versus buying new aluminum heads that is a decision you will have to make