Got the head back from X-ray on Saturday. No big surprises.
Here is a shot of the front half
Here is a closeup of a known shrink porosity problem.
I knew it was there because you can see it from the top. I wanted to leave it to see what it looked like in the X-ray. You can see it leads all the way over to the valve guide bore and in fact you can see it in the bore. I’ll do a weld repair on the top and call it a day as it’s too small a defect to affect the valve guide.
Controlling solidification shrinkage is one of the tougher aspects of casting metal. We’ll try something a little different on the next one.
Every head will be x-rayed before they get sold. This way people can have confidence in the casting before they invest in machining.