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will i pull enough vacuum?

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Old 09-28-2004, 10:52 PM
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Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
will i pull enough vacuum?

the 383 has trickflows and a lt1 custom comp cam 3315/3316 lobes

281/288 adv
230/236 @.050
.510/.520 with 1.5's .544/.555 with 1.6's

will i still have brakes or do i need an external vacuum canister???
Old 09-28-2004, 10:59 PM
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Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
Why does that cam look familiar? I can't seem to place my finger on it. It will come to me eventually.

It will probably be borderline. The fact that it's an EFI grind will help. Brakes themselves only need like 11-12" vacuum to operate. At those rates, you will need to be careful, but they should work. Plug in a vacuum gauge and take a reading if you are concerned. A vacuum resevoir is a small price to pay for the added brake functionality if that's what it boils down to.
Old 09-28-2004, 11:06 PM
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Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
lol youre all over these boards arent ya stek! im probably going to grab one but i just cant find a place to mount it in the car!! i already have to take out my windshield washer fluid bottle to make room for the msd box, i guess ill just replace the charcoal canister with the vacuum canister, who needs emissions
Old 09-29-2004, 10:28 AM
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Car: 89 GTA
Engine: 383
Transmission: 4L80E
Axle/Gears: 12 bolt-3.73
you will have enough vaccum
Old 09-29-2004, 11:10 AM
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Car: '92 Corvette, '89 1/2-a-'Vette
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Originally posted by 89gta383
you will have enough vaccum
I agree.
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