I was finishing porting a head and had a valve left in there, to polish around the seats. Well I tried to get it out and smacked it with a hammer. I ended up cracking the guide. After I got the valve out I was able to break the guide all the way down to the base. It looks like a half inch insert would fix it but Im not sure. It might take a 9/16. But is that doable. I have quite a few hours on this head and I dont want to junk it. So any help is appreciated.

 

Take the head to a machine shop. They can replace the broken guide. I would also replace the valve. If you broke the guide hitting the valve with a hammer the valve is probably bent.

 

Yeah, the guide is actually a separate piece pressed into the casting, they can drill it out and replace it... not too pricey usually.

 

Alright, ill check it out. What a relief.