Looking for smog parts for 1977 gmc c25 w/454

[jonbgood]

I can not seem to find a Egr valve for this year and engine size. The ones I find look similar or exact but my year isn’t listed or says not compatible. Does anyone know of a comparable that will function properly? The original part number is
GM 17094028

Also need a diverter valve, anyone got one?
Thanks for any help locating these items.
Damn California smog emissions ‍

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[fast 99]

https://www.ebay.com/itm/305536423141 egr Although I do not like aftermarket EGR valves finding an original GM part may be difficult.

Did you test the diverter valve?

 

[jonbgood]

https://www.ebay.com/itm/305536423141 egr Although I do not like aftermarket EGR valves finding an original GM part may be difficult.

Did you test the diverter valve?

That egr should work huh? Looks the same. No have not tested diverter valve, the connection to small vacuum hose broke off

 

[fast 99]

Aftermarket valves sometimes are a consolidation of a few part numbers and may not flow exactly the same as the OEM number. Today have to use what is available.

To repair the vacuum port use a piece from another vacuum item. Cut or break it off a piece and glue to the broken valve. Use a tooth pick inside as a holder until glue partially sets. I have successfully done it with 24 hour JB weld. The fast set JB doesn't work as well. After glue sets add a little extra on the outside as reinforcement.