The Stovebolt Site Forums The Shop Area Engine Shop Head Work

I have an "848" head from a '60-'62 261. While at the machine Shop they found it was cracked, the crack showed up during Magnafluxing. The crack is in the transition from the intake side to the exhaust, just past the radius. There was no leak there during pressure testing. The Machine Shop peened the area and pressure tested it again, again it past.

This head is going on "60 235, bored .060 over. I had the Machine shop Mill the head .040. They replaced the exhaust valve Guides as the were severely worn, the intakes guides were fine. I located a NOS set of 1.94 intake valves off EBay (I almost hated to open the box :D). I bought new stainless 1.5 SBC exhaust valves. I have everything cleaned and ready for assembly.

So, with all that information out of the way, I come to the question. Valve Guide seals? I have seen different opinions of how to go about this. Some say to use the newer style Umbrella seals on intake and exhaust. Some say to just use the Umbrella seals only on the intake, and use the "O" ring style on the exhaust. Looking for some real world knowledge on this.. Thanks.