Technical Flathead worn valve guide ?

Hi flathead gurus.

I think some valves have to much play in their guide.
Is there a way to measure this play ?

This is a French flat, guides are one piece style and plain.
There is no groove to put the seal in it.

Can the french guide be replaced by a 8ba part ?
I was told french valve are shorter than 8ba, and the lifter is longer.
But what about stem diameter ?

Thank you for your help.

 

btt

 

Pull the guides with the valves intact. Dis***emble the spring,retainers,etc until you have a valve and a guide only in your hand. Clean the shaft on the valve and put back in the guide about halfway. Grab the head of the valve while still holding the guide with your other hand. Try and move the valve sideways or any way to get it to “wiggle” while still in the guide bore. Any side play or “wiggle” that is felt is 2 much clearance and a tight guide should have a minimum of play(sideways). Make sure also the intake guides have the required “wide rubber o ring” to minimize oil loss. All guides(new or old) SHOULD have a place on the guide for the wide rubber seal,but the seals are only ESSENTIAL on the intakes only. Any real “slop” that is felt is 2 much clearance between the valve and guide.

 

Remember, the seats have to be ground if you replace the guide

 

Thanks for your replies.
I’m hesitating about replacing all the valves, guides and lifters because this car will run less than 1000 miles a year.
Except an oil consumption, is there another risk to run like this ?
Dilemma...

 

If the valve is loose in the guide, it will flop around and hammer out the seats. Eventually start leaking and burn out. But l would run it, it could run quite a while

 

Pay me now or pay me later. Best to fix it now.

 

Thanks for your replies.
Where can I find the value of the play ?
This way, it isn't only a question of feeling but I can definitly take a decision.

For example,as I work in a Audi garage in Europ, this is the way to do.