Can you see if there has been any work done to my heads?

66fs said

You can run 1.88 intakes and 1.60 Exhaust valves in a 273 without bore notches. You are getting close so you better check and give yourself some clearance. It also depends on valve lift.

There are no problems milling closed chambered heads small or big block. What do you mean by "wash out" ?

From what I've seen of the OP car, I do not think I'd change much. He has the best intake manifold and 65 heads probably flow better than most small port heads. Most good machinists will cast doubt on the need for hardened exhaust seats on Chrysler heads, especially when using stainless steel exhaust valves.

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On an open chamber head, there is a "lip" around the head where the chamber is. If the lip is not too deep (lets say 1-2 mm) then if you mill the heads where the lip is no longer there (becomes part of the head face), that is what they would call washout.

I disagree with the statement that you don't need hardened seats on the old heads. When I bought my 68 340-s, the PO had already rebuilt the engine. He didn't install hardened seats. Within a few months, the engine started running rough. When I took off the rocker arms, the exhaust valve on #7 was sticking 1/4" higher than the intake valve stem. The seat had been completely destroyed from the valve beating on it. I had hardened seats put in it and it was fine for many years.


It doesn't matter how hard your valves are when the seat is what takes the ****. It's the seat material that matters. It is the "weak link" in the system.

Say what you want about the hardened seats. If you choose not to use them, that is up to you. From my experience, I use them. You know the risks, make your own decision. Live with the consequences...