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

TBI clearance

Old Apr 30, 2003 | 07:44 PM
  #1  
txhotRS's Avatar
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From: Houston TX
TBI clearance

OK, does anyone have the height specs on the STOCK TBI intake manifold.???
DOES ANYONE HAVE THE HOLLEY TBI MANIFOLD.?? if you do, does it fit under the stock hood?? will it fit under the stock hood.. If I have 14x3 air cleaner ??, I know the edelbrock TBI performer will fit ... but DOES ANYONE have the 1" TBI spacer... what sort of clearance does this give you, with either the edelbrock, or the holley, ??? does it really make THAT MUCH of a difference
thanks guys...
ANY advice, ideas, are welcome:hail:
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Old Apr 30, 2003 | 10:38 PM
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vjo90RS8's Avatar
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From: San Jose, CA
Car: 2002 Z28
Engine: LS1
Transmission: 4L60E
Axle/Gears: 3.23
i have a 1/2" TBI spacer, 14x3 flat based open element with a flat top, and the stock intake and i am pushing the limit. A 1" spacer would probably fit with a drop base but youll have to do modifications to the throttle linkage and TV cable which might not back it worth it, thats y i went with the 1/2". I hear that the edelbrock intakes dont benefit from the TBI spacers because they already have longer runners compared to the stock intake so that is a plus with hood clearance. Same probably goes for the holley 2" tbi intake, but if you want to use EGR youll need a 5/8" spacer so that your TBI will clear the valve.

Also do a search on these intakes, questions like this are asked almost everyday.
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Old May 4, 2003 | 11:40 AM
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From: Brampton
Car: 91 Z28 Vert
Engine: 305
Transmission: TKO
Axle/Gears: 3.55 10-bolt
This might help you out......although I never did get any sort of response from anyone on thsi one..and the intake is goign on in about 1/2 weeks

https://www.thirdgen.org/techbb2/sho...=intake+height
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Old May 4, 2003 | 01:08 PM
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Chuck!'s Avatar
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From: Dayton, O.
Car: 91 Camaro Z28
Engine: LS7
Transmission: M12/T56
Axle/Gears: 3.79
The stock manifold is the same height as the Performer RPM without the tbi adaptor.

The holley pro-jection fits under the stock hood fine, I cant tell you how much clearance you'd have though. The performer rpm + holley adaptor rubs the bottom of my hood so I cant put a wingnut on it.

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Old May 4, 2003 | 07:42 PM
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From: Brampton
Car: 91 Z28 Vert
Engine: 305
Transmission: TKO
Axle/Gears: 3.55 10-bolt
Like I said I will be ripping into mine in the next week or so...I will keep you guys posted as to what my outcome is.
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Old May 5, 2003 | 08:06 PM
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txhotRS's Avatar
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tanager,
you are a G O D... thank you so so much, and please, if it's not too much trouble.. keep me posted, I don't have the budget to experiment with intakes... THANKS
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Old May 5, 2003 | 09:02 PM
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tanager11's Avatar
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From: Brampton
Car: 91 Z28 Vert
Engine: 305
Transmission: TKO
Axle/Gears: 3.55 10-bolt
Geez that is the first time I have been called that...ha ha ha.

I will be sure to keep you posed on things etc....if you dont hear from me just drop me an email...d2kearney@sympatico.ca...and I can fill you in on things as I end up finishing things.

D
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Old May 6, 2003 | 01:19 PM
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From: Austin
Car: 87 Wrangler
Engine: 355 TBI
Transmission: 700R4
So how do you put a 14x3 Aircleaner on without using the spacer rings? My coil and TPS sensor is in the way on mine.
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Old May 6, 2003 | 05:26 PM
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From: Brampton
Car: 91 Z28 Vert
Engine: 305
Transmission: TKO
Axle/Gears: 3.55 10-bolt
you have to use a non-drop base cleaner....or is it the other way around.....I cant remember...but I know you can use the one and not the other.
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Old May 6, 2003 | 05:38 PM
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Yes and No...

Yes it will fit without the spacer and a non-drop base cleaner. Unfortunately, if you need the EGR valve, you have to have the spacer for it to fit. If you put in the spacer, you will need to have something like a 14 x 2 or 2.5" cleaner..... Or you could do what I did and get the ASCD hood! No space problems with my setup.
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Old May 6, 2003 | 08:07 PM
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From: Brampton
Car: 91 Z28 Vert
Engine: 305
Transmission: TKO
Axle/Gears: 3.55 10-bolt
Ya I bet you dont have any hood clearance problems ha ha ha.
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