Vacuum for modulator valve?
Joined: Jun 2000
Posts: 5,364
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From: Enschede, Netherlands
Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98
Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI
Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27
Re: Vacuum for modulator valve?
no port left on the carb?
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Joined: Jan 2010
Posts: 86
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From: Susquehanna,PA
Car: 89 Iroc-Z
Engine: 350/carb
Transmission: th350
Re: Vacuum for modulator valve?
i have on on the back for the brake booster, the one on the front center for the pvc, and the one on the front to the right for vaccum advanced. can i use the last one for the mod. valve? btw its a eldlebrock 750
Joined: Apr 2005
Posts: 7,736
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: Vacuum for modulator valve?
Need to check what type port it is .
Most carbs have a "ported " vac port which does not see vac full time and one that has constant intake vac .You want the modulator to have full time vac.
Failing that you could '"T " into the dist vac line to save having to drill a new hole in intake
NB
Most aftermarket intake have a threaded port on the intake for brake hookup so you dont have to use a carb port
Most carbs have a "ported " vac port which does not see vac full time and one that has constant intake vac .You want the modulator to have full time vac.
Failing that you could '"T " into the dist vac line to save having to drill a new hole in intake
NB
Most aftermarket intake have a threaded port on the intake for brake hookup so you dont have to use a carb port
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Junior Member
iTrader: (2)
Joined: Jan 2010
Posts: 86
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From: Susquehanna,PA
Car: 89 Iroc-Z
Engine: 350/carb
Transmission: th350
Re: Vacuum for modulator valve?
yes i thought that to about most aftermarket intakes. but after i put this one on i realized it didn't have one. and fyi this is a HI-TECH Torque-Link intake.
Vette- so what you are saying is that i can put a T in my vacuum advance and it will still work?. I think the other vacuum port is "ported". I will recheck when it comes time to start-up.
Vette- so what you are saying is that i can put a T in my vacuum advance and it will still work?. I think the other vacuum port is "ported". I will recheck when it comes time to start-up.
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