TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

Alright so I got my open element but what...

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Old Apr 8, 2006 | 10:44 AM
  #1  
r0nin89's Avatar
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From: Point Pleasant, NJ
Car: 1987 Chevy Stepside
Engine: 350 TBI w/ a Cam
Transmission: 3 Speed Stick w/ granny low
Alright so I got my open element but what...

What is this refering to in the instructions. Its got me a little confused and I'm trying to do this in the rain...

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  • The Breather. You can either put the breather filter back on the breather tube using your stock breather, letting it stand freely, or you can purchase an aftermarket one and replace the breather tube with it.
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Old Apr 8, 2006 | 10:50 AM
  #2  
DM91RS's Avatar
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From: Ga
Car: 91 RS
Engine: 305
Transmission: T5
Axle/Gears: 3.73
Are you refering to the valve cover breather?
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Old Apr 8, 2006 | 10:55 AM
  #3  
r0nin89's Avatar
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From: Point Pleasant, NJ
Car: 1987 Chevy Stepside
Engine: 350 TBI w/ a Cam
Transmission: 3 Speed Stick w/ granny low
Thats the thing i'm not sure but i beleive so. It's from our official Open element mword guide
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Old Apr 8, 2006 | 11:17 AM
  #4  
Cadillac's Avatar
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From: Marietta, GA
Car: '91 Firebird Convertible
Engine: 305 TBI (LO3)
Transmission: 700r4, Vette Servo
Axle/Gears: 3.27 9 Bolt, PBR disks
Originally Posted by r0nin89
Thats the thing i'm not sure but i beleive so. It's from our official Open element mword guide
Go get one of these from the local Auto Zone, Napa, or whatever is in your area:

Example of a valve cover breather (Summit)

The next question is what did you do with the IAC?
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Old Apr 8, 2006 | 11:22 AM
  #5  
r0nin89's Avatar
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From: Point Pleasant, NJ
Car: 1987 Chevy Stepside
Engine: 350 TBI w/ a Cam
Transmission: 3 Speed Stick w/ granny low
Does this replace the tube from the left (facing the engine from front) valve cover that hooked into the old air cleaner?
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Old Apr 8, 2006 | 11:50 AM
  #6  
Cadillac's Avatar
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From: Marietta, GA
Car: '91 Firebird Convertible
Engine: 305 TBI (LO3)
Transmission: 700r4, Vette Servo
Axle/Gears: 3.27 9 Bolt, PBR disks
Originally Posted by r0nin89
Does this replace the tube from the left (facing the engine from front) valve cover that hooked into the old air cleaner?
Yessir.
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Old Apr 8, 2006 | 01:53 PM
  #7  
r0nin89's Avatar
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From: Point Pleasant, NJ
Car: 1987 Chevy Stepside
Engine: 350 TBI w/ a Cam
Transmission: 3 Speed Stick w/ granny low
Ahh duh. I'm too used to seeing an engine sit on a stand... You know the diameter of that hole because I bought an 1-1/4 I beleive and I can already see its going to be too big.

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Old Apr 8, 2006 | 02:52 PM
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90CamaroTBI's Avatar
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From: Waldorf, MD
Car: 91 Formula, 89 IROC
Engine: LB9, LB9
Transmission: 700R4, 700R4
Axle/Gears: Posi 2.73, Posi 2.73
I would love to know what size that hole is, ive been trying to figure it out for 6 months now. I want one of those push in breathers, but im stuck with a cheap piece until i find one.
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Old Apr 8, 2006 | 04:15 PM
  #9  
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From: Pittsburgh & Allentown PA
Car: 1992 Z28 (Heritage Edition)
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73 Posi
Originally Posted by 90CamaroTBI
I would love to know what size that hole is, ive been trying to figure it out for 6 months now. I want one of those push in breathers, but im stuck with a cheap piece until i find one.
The diameter is 3/4 inch. I know that the Mr. Gasket breather that has the 3/4 inch diam. neck has a huge grommit around it, which makes it impossible to fit. So keep in mind that you may need to purchase a smaller grommit along with the new breather (incase the grommit that comes with the breather is too big).
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Old Apr 9, 2006 | 09:52 PM
  #10  
r0nin89's Avatar
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From: Point Pleasant, NJ
Car: 1987 Chevy Stepside
Engine: 350 TBI w/ a Cam
Transmission: 3 Speed Stick w/ granny low
Talk about hitting nails on the heads before you even know the nails are there... I had to buy a new grommet after I bought a Mr.Gasket breather...
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Old Jul 25, 2006 | 05:12 PM
  #11  
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From: Cape May, New Jersey
Car: 92 Firebird
Engine: 5.0L V8
Transmission: 700-R4
Ok I'll chime in here cause I just finished my set up 15 mins ago
I purchased a 1" grommet from Summit. I measured twice, and came up with a 1" hole in my valve cover, not 3/4. So if he came up with 3/4 and I came up with 1" you might want to measure yours to be completely sure.


Part# TRD-6077 Trans-Dapt Performance Valve Cover Grommets: TRD-6077 - summitracing.com

Part# KNN-62-1160 Summit Racing - High Performance Car and Truck Parts | 800-230-3030

This should take you directly to what I purchased.
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