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

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Old Jul 7, 2015 | 08:55 PM
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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
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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
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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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