Tell me about these heads - 2658920 66-67 273-318ci

KnuckleDuster said

Cool!
I've had this engine for probably 20 years, didn't realize there even was a closed chamber head used on 318's until I pulled the heads off. I thought maybe the had been milled. I got the whole engine for $50 from my Uncle.
Here's a pic next to some 80's 163's I also have for comparison. I was told the 163's have hardened seats? How can you tell by looking?

Click to expand...

I had my head guy put the hardened seats in when he did my heads.... They were definitely not in there from the factory... I had him port them and put 360 valves in them, and we always install hardened seats on the exhaust valves.

To see if it had hardened seats installed, you have to zoom in close on the exhaust valve and look for an insert pressed in for the seat, then they machine it for the valve after pressing in the seat. It may be hard to see sometimes if done as they are interference fit in the head.