Royals65i6
Active member
I have a 1980 cylinder head that I have been working on for a while now, and I can't find any information about whether or not to add hardened valve seats after increasing the exhaust value opening. I assume when increasing the diameter of the exhaust value opening from 1.38 to 1.5 I would be eliminating the hardened seats that were already there. How much over 1.5 can be removed to make room for new seats?
Thanks for the help
Thanks for the help