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What is the correct vacuum pressure supposed to be on a Chevy 350?

Anonymous

∙ 15y ago

Updated: 9/17/2023

19 to 21 inches of vacuum at an idle, The higher the better. If the engine has a high performance cam then vacuum will be alot lower.

When you rev the engine up vacuum should drop and then come right back up.

Wiki User

∙ 15y ago

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