C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Jun 27, 2015 | 12:26 AM
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marshal135
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Default Vac ?

Hello Forum,
1 other ? came to mind while I was pondering over my vac issues.
Should I have the same Vac inches at the supply and control lines at the relay as I do coming off the manifold?
The reason I ask is because it appears to dimminish greatly over the
length of travel from the holding tank to the relay in the front between the head lights.
My 68 has 19 inch vac at manifold and 3 1/2 to 4 ish inch vac at the supply line. The control hose is 0?
Any body measure theirs?
Thanks the saga continues.
Marshal.
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Old Jun 27, 2015 | 08:33 AM
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Marshal,

You should have the same vacuum reading throughout the system. If not, you have a restriction or a vacuum leak.
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