How much Vacuum should I have?

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Aug 17, 2009 | 03:01 PM

Travis93

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Racer

Joined: Apr 2006

Posts: 405

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From: Twinsburg OH

How much Vacuum should I have?

It looks like stock should be about 20 to 22 inches. My car is modified but 10 inches seems real low. I have an LT1 with Lloyd Elliot level 2 ported stock heads and 1.6 cam with supporting mods.

Aug 18, 2009 | 03:03 PM

Travis93

Thread Starter

Racer

Joined: Apr 2006

Posts: 405

Likes: 1

From: Twinsburg OH

No one knows about how much vacuum I should have with a mild cam ported heads and slightly larger valves?

Aug 18, 2009 | 04:59 PM

bjankuski

Safety Car

Joined: Sep 2001

Posts: 4,157

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From: Glenbeulah Wi

Quote:

Originally Posted by Travis93

No one knows about how much vacuum I should have with a mild cam ported heads and slightly larger valves?

You did not provide enough information to get a good answer. What are the cam specifications and what is your idle speed and were your reading in park or in gear?

It is not unusual for modified engines to have 10" of vacuum. A stock engine will be 15" to 18" at idle in park.

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