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John Mummert (2/28/2013)
....Heads might have had sodium filled exhaust valves. Not sure what year they were introduced. The oldest heads I've seen with sodium valves were 1959. They were common in -471 and C1TE heads.
If it has ECR heads it is HD truck or industrial. I've never seen a set of these heads in person to see if they had sodium valves.John. The oldest heads I currently have with the sodium exhaust valves are pairs of ECR-A’s and ECR-C’s. Based on the date codes, they are 1955/1956 vintage.
  Lorena, Texas (South of Waco)
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Ted: I didn't mean to say that '57 heads couldn't have come with sodium valves, I meant to say that they weren't put in G heads, but in industrial casting numbered heads. Incidentally, the sodium version of the 471 heads had B9TE casting numbers.
John - "The Hoosier Hurricane"
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John (Hoosier). No problem. I was answering John (Mummert) in that the oldest sodium exhaust valves he had seen in Y heads was for the ’59 models. I have had cylinder heads with sodium exhaust valves going back to at least to 1955 for the Y engines just as a matter of general information.
Lorena, Texas (South of Waco)
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I have a pair of ECR-D I think with the sodium valves and these heads have the smallest combustion chamber I have ever seen, almost no step from head surface to chamber. Do you know what the combustion chamber size is on your ECR heads Ted?
 55 Vicky & customline 58 Rack Dump, 55 F350 yard truck, 57 F100 59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?
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Heres a picture of what appears to be a 1 bbl carb on a Y-Block Onan generator. Look as like an adapter on a 57 and later 2 bbl manifold 
http://ford-y-block.com 20 miles east of San Diego, 20 miles north of Mexico 
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In reference to sodium filled exhaust valves in the truck heads, I’ve come across an earlier model Y head with sodium filled valves than what’s posted above. This one is 1954 vintage with EBZ-L casting numbers.
Lorena, Texas (South of Waco)
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