DHC8FO

Having problems with oil and water mixing, overheating, and blew up a radiator hose. Pretty sure HG problem, so I started the process. Go the cam tower off and noticed discoloration on the halve spring head (unsure of what it shold be called, but you get the idea from the picture.

Any idea what would be causing this, and is it a problem?

Peckster

It could have been the oil cooler too. Did you check to see if one of your plugs looked cleaner than the others?

DHC8FO

Tried the oil cooler flange and tube seal 1st. Was still doing it. Pulled the head found #4 blew out. The plug on #4 was only slightly cleaner. Had widefire HG, I really think all the widefire gasket did was allow for the car to continue to run longer. Haven't checkeed the head yet, think it's ok, but I have another machined ad ready to go for another engine I was planning to build, I'll swap and send it out to the machine shop. I'll attach pictures when I get back in town.