So I had my heads reworked recently (surfaced, new bronze guides, hardened seats) and one of the things they did was installed larger exhaust seats. Thats all fine, but now im not sure which size valves to order for the exhaust. I am pretty sure he said they are .100" bigger in diameter than the old standard valves. Do I need to order 1.73" valves or 1.830"? Thanks for the help.

 

how about going back to them and get them to clarify what size they put in?

But stock is 1.65 so .100 would be 1.75 which is pretty close to CJ valve size anyway.