C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

vacuum

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Jul 7, 2015 | 08:55 PM

#1

jseremba

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Drifting

Joined: Feb 2013

Posts: 1,460

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vacuum

Hi everybody,

I own a 1984 4 plus 3 Crossfire. I just put roller rockers and a new cam, mild, a lot of work. Mine had two ROUND lobes. Looked like journals. Does anyone know what the vacuum should be.

Thank you,
Joe

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Old

Jul 7, 2015 | 09:29 PM

#2

C409

Le Mans Master

Joined: Feb 2005

Posts: 6,477

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From: Clearwater Florida

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Quote:

Originally Posted by jseremba

Hi everybody,

I own a 1984 4 plus 3 Crossfire. I just put roller rockers and a new cam, mild, a lot of work. Mine had two ROUND lobes. Looked like journals. Does anyone know what the vacuum should be.

Thank you,
Joe

..... You should see something between 15 and 20 inches ........ depends on your elevation and accuracy of the gauge .....

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Old

Jul 7, 2015 | 09:35 PM

#3

cohocarl

Burning Brakes

Joined: Jun 2000

Posts: 865

Likes: 6

From: Auburn Michigan

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Really depends on the camshaft you put in. More info on the cam would be needed, but if it's similar to stock, I'd agree in the 20 ballpark.
The 383 I just built has about 9 at idle.

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