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Throttle Body & Vavle Cover Question

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Old Sep 28, 2014 | 05:33 PM
  #1  
The Project's Avatar
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From: West of Toronto
Car: 89 IROC
Engine: 305 TPI / ZZ4 cam
Transmission: Stage 2 700R4, LS1 driveshaft
Axle/Gears: Strange 3.42 w/ Auburn
Throttle Body & Vavle Cover Question

Doing a swap and have a few questions - The two hoses that come out the pass side of the TB, Top one goes behind the motor and attaches to the brake booster? Correct?

Where does the lower hose go? Pass side valve cover grommet?

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Also, What hose goes into the pass side breather hole on the valve cover and where does it come from?


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Old Sep 28, 2014 | 06:43 PM
  #2  
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From: Long Island, NY
Car: 87 Trans Am, 99 WS6, 16 Mustang GT
Engine: LB9, LS1
Transmission: 700R4, T56
Axle/Gears: 3.42 Posi, 4.10 Posi
Re: Throttle Body & Vavle Cover Question

That top spout connects to the passenger side breather. Red circles are what need to be matched up.Name:  motor_zps61bac2a1.jpg
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The lower spout on the TB is for coolant, it connects to the heater control valve.

EDIT: Christ I'm losing it. Even just looking at the picture, that lower spout is vacuum.

Last edited by NowhereFast; Sep 28, 2014 at 11:01 PM.
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Old Sep 28, 2014 | 07:26 PM
  #3  
8Mike9's Avatar
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From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
Re: Throttle Body & Vavle Cover Question

Just a note, the pass side isn't a PCV valve, just a plastic elbow.
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Old Sep 28, 2014 | 10:43 PM
  #4  
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Car: 85 Trans Am
Engine: 98 Vortec 350 LT1 Cam w/ TPI
Transmission: T56
Axle/Gears: 9 bolt 3:27
Re: Throttle Body & Vavle Cover Question

8Mike9 is correct that the passenger side is just the breather not the PCV. The PCV plugs into a barbed fitting just behind the drivers side runners on the lower intake. The brake booster connects to a barbed fitting on the drivers side back corner of the upper plenum.

As for the bottom port it is supposed to connect to the EVAP canister.

This may help
http://chevythunder.com/1985-86%205....%20diagram.gif
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Old Sep 29, 2014 | 02:43 PM
  #5  
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From: West of Toronto
Car: 89 IROC
Engine: 305 TPI / ZZ4 cam
Transmission: Stage 2 700R4, LS1 driveshaft
Axle/Gears: Strange 3.42 w/ Auburn
Re: Throttle Body & Vavle Cover Question

thanks for the help guys. MUCH APPRECIATED.

Motor has been apart for two years and memory is getting old.
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Old Sep 29, 2014 | 06:45 PM
  #6  
MoJoe's Avatar
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From: Golden, CO
Car: 87 IROC
Engine: L31 350
Transmission: T56
Axle/Gears: 4.10 D44
Re: Throttle Body & Vavle Cover Question

For a Camaro, the evap can is on the driver's side. You should have a hose that loops a 180* turn to go under the TB to a hard plastic line to reach the evap can.
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