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I have a 1977 P30 Midas Class A motorhome with a 454 Chevy. I need a exhaust emission vaccum diagram.
It has a air pump and egr value and I'm located in Calif.
With your RV vin---go to local GM dealer---they should have all that in their computers under "light Truck"---since your MH is really truck- even Blazer / surbaban diagram might be the same. look under emissions.controls..
rich.