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How much vacuum with stock cam and gt40 heads/intake

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Old 04-27-2008, 04:53 PM
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gtwhite91
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Default How much vacuum with stock cam and gt40 heads/intake
I just changed heads/intake to Gt40 Y heads and Gt40 tubular with Cobra RRs.

My vacuum hovers around 16 inches with the idle at about 780rpm and timing at 10 BTDC.

What should my vacuum be at?

I noticed that if I increase the idle speed, the vacuum will go up to almost 19-20inches.

Thanks in advance.
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Old 04-27-2008, 05:51 PM
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silver91gt
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Default RE: How much vacuum with stock cam and gt40 heads/intake
that sounds good, I wish I could get mine that high.

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Old 04-27-2008, 05:56 PM
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HACKGT350
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Default RE: How much vacuum with stock cam and gt40 heads/intake
thats about right mine is about 19in's. the only thing that will change your manifold vacuum is your cam and a vacuum leak
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Old 04-27-2008, 06:32 PM
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PRO50SC
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Default RE: How much vacuum with stock cam and gt40 heads/intake
Yeah, mine runs around 16" as well.
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