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Is there a current GM replacement?
Can they be rebuilt?
Can you use the guts of a replacement to rebuild your original?
Wouldn't an NORS one have issues with dried diaphragm?
There is NO GM replacement for the 1967 diverter valves. As a matter of fact, there never has been a replacement or supercessive part number for these items ever since they were GM-discontinued. The small block valve, GM #7033546 was discontinued about 20 years ago. The big block valve, GM #7033547, was discontinued about 25 years ago.
There are a few folks who specialize in the rebuilding of these valves. Bill Hodel is one. Don Dorfman was another, but I think he's out of the business now.
Thanks, but it is surprising after reading all your posts, that this part ended so soon, and had no replacement. I would have thought, because it was a smog component, it would have been a government mandated service replacement for life.
These cars were less than 20 years old, the big block was only 11. I guess this was a one year one model part.
Well this will be an adventure, as I asked above, I know there are NOldS around and their pricey. I would be afraid that the internal rubber components would be in poor shape. What has been your experience with the parts in your collection that have rubber diaphragms?
There is no government requirement that SERVICE emissions control parts be available "for life". The very longest that the manufacturers have to maintain SERVICE stocks is 7 years and that only applies to "primary" parts. I don't know if these valves even qualify as a "primary" part, but they may. In any event, GM had them available for well over 7 years. As further substantiation, there are some emissions-related components for C4s that are no longer available from GM. So, you can imagine how they would "feel" about such components for C2s.
These valves were used in PRODUCTION for only the 1967 model year. However, they SERVICE 2 model years---1966 and 1967. They were used for both Corvettes as well as passenger cars, but only California-delivered cars got them. Finding NOS examples of one of these valves, especially the 427 valve, is very difficult. Expect to pay a king's ransom if you do find one.
As far as rubber components go, the notion that they have a short life in storage is a myth. As long as they are stored at moderate temperatures and kept out of sunlight, they last a VERY long time. I have some NOS rubber parts in my collection that are well over 35 years old. Most look just like the day they were new. Although I can't see the rubber diaphragms of the many NOS diverter valves I have [none for sale], I would expect them to be just fine.
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