Are the 454 throttle bodies common?? Would I find one at the local wreckers?? What engines did they come on?? Could I use this with a 305, or is it just for 350s and up??

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Godti
'89 Trans Am (Red)
305 TBI 5spd

 

I dunno how common they are but they're out there. you can use them on a 305 or 350 but the bores will be bigger. If you use them on a 305 or 350 you should use the stock injectors on the new base and maybe turn up the pressure a bit.

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-Tas
'89 Formula WS-6
[soon to be Torch Red with black hood and headlights =) ]

305, TBI, auto, 14x3 chrome flat based open element with K&N, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz
ICQ 82881207

 

Ok, but I still need to know what sort of vehicles they were off of?? and or a part number.

 

454cid GM trucks: 2500s, 3500s, Suburbans....

 

Trucks with the 454 TBI V8 have "N" in the engine position of the VIN. They were available from 1987-1991. I hope this helps ya' in your search.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

It does. I take it that just cause its a 454 TBI, its mounted on the 350 (in the trucks)?? Is the engine any good?? Maybe I should try and snag the whole engine up.

 

Its called the 454 TBI because it comes on the 454 cubic inch big block engines in full size GM trucks. The 350 small block trucks use the same TBI unit you already have, but with larger injectors.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

You guys probably think Im an idiot by now, with all these silly questions.

Does the 454 TBI mount any different than my 305 TBI?? Can I just switch the throttle bodys around?? I know I have to keep the stock injectors.


The principle behind this is, it allows more air in? and or fuel??

[This message has been edited by Godti (edited January 16, 2001).]

 

I called the local wreckers, they dont have one for sale. Does anyone know anyone with one they would like to get rid of?? Let me know.

 

Yeah, it'll bolt right on.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

I've found them before by going through a junk yard with a national parts search. They were running around $400.

Another option I've been hearing about is to have your stock TBI unit bored out to 2"

 

Godti,
I have a spare 454 TBI. Will let it go for $300.00. Includes shipping to Canada.

 

You could also buy the Holley 670 cfm (same as 454) for a little over $300, and have a new one with new injectors. You can specify these for the 5.0L (305) They say "Truck TBI'S" but they will work on our cars. I found a 454 TB for $100, but that's a non-typical price, I just got lucky.

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82 Z28 350, Ported #882 Heads, Performer RPM cam and intake, hedman headers,650 Demon carb,
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Best ET: 12.52@107.2
Future plans: Dart headed, Roller cammed 383 in early '01


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock
New Best ET: 14.91 @92.9
http://www.bassettracing.cz28.com

 

i got my 454 with injectors and an afpr for under 200$. save your money. have a shop bore your little one. shouldnt cost over 150. cheaper than 300.

 

Good to see ya back, howd the moving go??

Thanks, I think I will look into boring my TBI, I have to go from my stock 1 and 3/4" to a 2" bore right??

 

FYI, it wont fit your stock manifold. the bolt patterns are the same but the 2" bore isnt going to help with the small bore manifold. Just an FYI if you dont already have an aftermarket intake.

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305 TBI
700-R4
L98 cam, 1 5/8 headers, 2 1/2 y-pipe, 4bbl edelbrock performer, holley adapter, open element K&N, afpr, flowmaster catback, MSD coil, accel wires cap & rotor, vette servos, shift kit, 2000 stall converter, TC lockup switch, all the free mods and some I left out.

 

What if I plan on gettting a performer intake?

 

move went good, but im not really back, not like i want to be, my cable modem is having problems in the apartment, its flat out not working. so i wont be on as much till it is. but i will check up on the boards daily from school until im running at speed at home.

anyway, you can solve the blade clearance problem from a 2"tbi to your stock 1 11/16 manifold holes by getting a 4 dollar paper/cardboard spacer that has tapered bores. thats what im using to run my 454 tbi on my stock manifold. ive never had a tbi bored from 1 11/16 to 2 but ive studdied the tbi, and it possible without doing any harm and i know there are people here that have done it before. anyway hope that answers some ?'s

 

Get to the problem at the source, change the intake, and use an adapter with 2" bores like the holley adapter.

------------------
305 TBI
700-R4
L98 cam, 1 5/8 headers, 2 1/2 y-pipe, 4bbl edelbrock performer, holley adapter, open element K&N, afpr, flowmaster catback, MSD coil, accel wires cap & rotor, vette servos, shift kit, 2000 stall converter, TC lockup switch, all the free mods and some I left out.

 

I think the Edelbrock TBI manifold has the same 1 11/16" smaller bores, not the 2" bores.

 

Does edelbrock make an intake with a 2" bore?? To match a stock TBI bored to 2"??

 

Edelbrock's only TBI intake is the 1.68" one. I would imagine that you could bore it out to 2.00". Holley makes a TBI intake with 2.00" bores...but I've heard bad things about it's quality. It'd be cheaper though to just get a carb intake and the adaptor.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

ya, from what ive heard, get a carb intake, and the holley adapter. Thats what ive got, its just not on the car yet, im waiting for the spacer.
but for those of you are thinking about poppin on a bigger tbi and are expecting performance. think again, a larger tbi does nothing much noticable except a slightly lower exhaust tone, and a lag from idle to hard acceleration. Just changin the intake without using a new tbi, will yeild a lot more performance than the previously mentioned idea. AND finally, obviously, do both = best performance.

 

Edelbrock used to have a 2" TBI intake but not anymore. If I get that intake I'll try to bore it but by the look of some cutaway shots it might need to be sleeved.

 

The holley TBI manifold moves the TBi unit forward making your TV/throttle cable not fit properly. (from what i've heard) And the edlebrock only has the small 1 11/16 in bore. The 4bbl with the adapter is the way to go.

------------------
305 TBI
700-R4
L98 cam, 1 5/8 headers, 2 1/2 y-pipe, 4bbl edelbrock performer, holley adapter, open element K&N, afpr, flowmaster catback, MSD coil, accel wires cap & rotor, vette servos, shift kit, 2000 stall converter, TC lockup switch, all the free mods and some I left out.

 

If you bore your stock TB to 2", what'dya do about the blades?? Wont they be too small??

 

You can't go to 2" on a stock tbi w/o hitting the bearings. Go to 48mm and use stock tpi plates. This works out to about 1.9". I have a spare pair of plates I'll part with if anyone is going to do it. Machining out the bores will run you about 30 dollars at a machine shop.

 

Plates, by that you mean the throttle body blades, in the bores??

 

they screw right in?
U dont need a different shaft?

 

joB if you could be more specific please on what bearing you are going to hit???

what is the difference between the stock casting of 1 11/16 and 2" tbi??

Ive analyized both and they seem very close to being the same exact thing except for the bore size. did they move these said bearings in the 454 casting? i dont know of any bearings within the tbi unit. so if you would please explain why you cant go to 2"

thanks.

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IM: snflupigus | ICQ: 96787192

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Open Element Tech Article

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