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

Brake booster size and manifold vacuum

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Old 01-19-2018, 10:08 AM
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ULTM8Z
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Default Brake booster size and manifold vacuum

Can anyone please tell me what the brake booster size is on a 88-91 model year as well as the manifold vacuum being pulled at idle?
Old 01-19-2018, 10:47 AM
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ddahlgren
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a 88 and 91 do not take the same booster is a start. Most auto parts web site will list the booster size under 'specs'.
Old 01-19-2018, 10:56 AM
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ULTM8Z
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NAPA is saying 8 7/8 or 9 3/4.

What about manifold vacuum? What does a stock L98 Vette pull?

Last edited by ULTM8Z; 01-19-2018 at 10:57 AM.
Old 01-19-2018, 03:43 PM
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ddahlgren
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16 to 18 inches more during deceleration if a stick.
Old 01-19-2018, 04:30 PM
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ULTM8Z
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Thanks guys

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