Robert here

[Remeikle]

Hello, I'm in Tucson. Dad wants me to get his motorhome running so he can sell it. It's got a 1987 Chevy frame and carbureted 7.3 liter 454 engine. Pack rats have chewed many of the vacuum and emission control rubber hoses. I'm looking for a vacuum diagram - especially one that shows where the main manifold vacuum source goes to at the manifold vacuum inlet. Please help.

 

[Mr Clean]

 

[bucket]

Howdy from Ohio!

What do you mean by the "main" vacuum source?

Typically, there's a 3/8" hard line that screws into the base of the carb for large items like a power brake booster. For other things like shift modulator, hvac vacuum supply, etc, there is a vacuum "tree" that screws into a rear intake runner on the manifold, near the distributor. They usually have two or three vacuum nipples on them.

 

[Strick]

Welcome from NC.

 

[Soundmound]

Welcome from Central Washington!

 

[Craig 85]

A couple of questions. Is it an EFI motor or were the motor homes still carbed? It's a 7.4L.
This is for a California pre 1/1/85 454 k30. Single smog pump, factory no cats with dual exhaust.

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