Hi all , a quick question re Exhaust valves, are the standard factory valves out of a 1986 cosworth yb sodium filled?



Thanks very much.

Tim.

 

Yes they are.

 

Thanks very much. Also does anyone know if it is possible to buy standard inlet and exhaust valves with an oversized valve stem?


Cheers.

Tim.

 

Why would you want such a thing ?

Cant imagine it's something Ford would ever have offered.

 

It seems unlikely. Rather than over boring worn valve guides to take a bigger valve stem, just replace the worn guides.

 

I have been told that removing old guides there is a very big chance that you would damage the guide bores on removal. Is there a preferred method of removing the guides avoiding scuffing/damage?


Cheers.


Tim.

 

Yes.

Give head to machine shop. Tell them to fix it. Get head back.

That's my preferred method lol

 

never had a problem replacing cossie guides yet. There is another method used which puts a bronze sleeve inside the guide, but i wouldn't bother on a cossie when the guides are easily and cheaply replaced. As long as you use a good machine shop, you shouldn't have an issue.