TBI Vortec?

[Blue 82]

GM used adapter plates on the BBC TBI's
I have one floating around in the garage
It's for a 2" TBI to a spreadbore intake
It has neat vanes to re-direct the air/fuel flow
They were about 1.25" thick and were hollow for hot water to flow in/out

The Edelbrock 2116 would be a good deal
TBI or Carb
Good Idea

[Blue 82]

I found one on Ebay (spacer)
The auction includes the TB etc...
I just wanted to show what the GM unit looks like.

[81Cheyenne]

Cool!  I noticed that you can get the aftermarket plates with the TBI holes either toward the front (barrels) in the middle or in the back. Wonder which one works the best? Looks like the GM plate kind of splits the difference. I'll look for that listing on eBay. Thanks.

Update:
Well, I threw a bid at it. Do you think that throttle body off a 454 would be suitable for a 383?

[Blue 82]

Here ya go
http://cgi.ebay.com/ebaymotors/Chevy-Big-Block-BBC-454-TBI-Adapter-Plate-EFI_W0QQcmdZViewItemQQ_trkparmsZ72Q3a635Q7c39Q3a1Q7c65Q3a12QQ_trksidZp3286Q2ec0Q2em14QQhashZitem280228700591QQitemZ280228700591




This one looks a bit cleaner
http://cgi.ebay.com/ebaymotors/Original-454-Carburetor-to-TBI-Adapter_W0QQcmdZViewItemQQ_trkparmsZ72Q3a635Q7c39Q3a1Q7c65Q3a12QQ_trksidZp3286Q2ec0Q2em14QQhashZitem190222976496QQitemZ190222976496

[Blue 82]

Update:
Well, I threw a bid at it. Do you think that throttle body off a 454 would be suitable for a 383?

I was gonna do the whole TBI thing a few years ago on an 88 shortbed
I aquired a bunch of TBI stuff and played around with it
I'm sure a 454 throttle body would feed a 383
I have one of those floating around in the garage too
I went as far as boring a stock 350 manifold to accept the 2" TB
Actually I machined a bunch of em and sold em
(I sold the truck for an offer I couldn't refuse, that ended my TBI experiments)

from what I've seen with TBI
Unless you are burning your own chips
or have access to someone that has been down the 383 TBI road before that can help you (with what works and doesn't work) you are pretty much p*ssing in the wind.

I've helped some of the tuners on some of the other chevy truck forums get the 383 TBI's going (mainly parts and 9C1/L19 injectors etc...no tech stuff)
From what I've seen, it's much easier and cost effective to slap a carb on it with a good HEI and call it a day on a conversion like you are doing. The later TBI trucks came with the 4L60E tranny which had to keep the TBI setup.

Most of the guys would jack up the fuel pressure and try to run the SBC injectors at 100% duty cycle till they failed, others have tried the L19 (454)  injectors only to run fat/soggy on the bottom end.

I'm sure someone has figuered it out by now
you just gotta find em

[Blue 82]

Jasper has a 280hp 383 TBI
Dart heads etc......
Needs a custom chip etc....
Not for use on pollution controled vehicles ect....

http://www.jasperengines.com/pdf/383_TBI_Comparison.pdf

(only 280hp? you can get an easy 325hp out of a carbed, Vortec headed 350 with your eyes closed....)

[Blue 82]

Here's an example of a 383 TBI
notice the flat spot at 3500/85mph
Notice the low shift points
while he's got a decent running TBI truck
he'd see nothing but back bumper from a carbed 383
(he nails it at the 44 second mark, takes 24-25 seconds to get to 100)
http://www.youtube.com/watch?v=M6hL8aku4-8

[81Cheyenne]

I was just talking to a friend who likes the Holley Pro-jection setup. He said that he has the ecm under his seat and can tweak the pots for economy or power when the need arises. Do you (or anybody) have any opinions on the Holley TBI?

[Blue 82]

Ask your friend a few questions

a) does it have an air temp sensor
b) does it have an airflow sensor
c) does it have a manifold vacuum sensor
d) can it increase idle RPM when the AC compressor kicks on
e) tell me about your O2 sensor

I asked a Holley Rep these questions at a Chevy event a few years ago, I was not impressed with his answers.
Maybe things have changed.

[81Cheyenne]

Ask your friend a few questions

a) does it have an air temp sensor
b) does it have an airflow sensor
c) does it have a manifold vacuum sensor
d) can it increase idle RPM when the AC compressor kicks on
e) tell me about your O2 sensor

I asked a Holley Rep these questions at a Chevy event a few years ago, I was not impressed with his answers.
Maybe things have changed.

Just looking at the manual for the Pro-Ject available on the Holley web site:
a) no air temp sensor (just coolant temp)
b) no air flow sensor
c) no manifold vacuum sensor
d) seems to have a fast idle solenoid for A/C compressor
e) has an O2 sensor but listed as "optional"

Looks like their MPFI setup has all the sensors.

[Blue 82]

I looked at converting to EFI a few years ago

First I looked at the Megasquirt
http://www.megasquirt.info/allQs.htm
I was thinking of doing an L98 type conversion for my 82
Cool stuff for a DIY deal

F.A.S.T. has a few choices
http://www.fuelairspark.com/Products/chevy/sb/efi.asp
But I hear they are pricey, but easy to get big HP/TQ

There is just simply not enough time in my life to do the things I "want" to do.
Family, Work and Fishing are at the top of the "need to do" list...
I pull my boat at least 6000 miles a year, spending a couple grand and countless hours wrenching, ebaying and tuning to convert to EFI would have cut into my FWF time....

That's why I went with a Carb.
http://smicarburetor.com/products_/?sfID1=14&sfID2=9&sfID3=32
Took me all of 45 minutes to bolt it on
went fishing the next day

I pull also with a 94 TBI (5.7L-3.73's) Suburban or a 2000 Tahoe Limited (5.7L-3.42's).
The 82 has more grunt with the TH350 and 3.08's and I don't have to worry about jumping in it after a day of fishing/diving/sunscreen/bugs/blood/mud/seaweed etc.....
I get roughly the same MPG towing as the EFI trucks with the SMI Stage II carb (within .5 MPG). Unloaded, the EFI trucks get about 2 MPG better on the road (city driving MPG sucks in all three)

 Now that Gas is $4.00+ a gallon, I guess an extra MPG or two, may have helped, but who could have forseen that. My solution is to make more money, I'm not cutting back on my standard of living, the Tuna are running and Lobster season is right around the corner......

[Blue 82]

http://www.megasquirt.info/

[81Cheyenne]

There is just simply not enough time in my life to do the things I "want" to do.
Family, Work and Fishing are at the top of the "need to do" list...
I pull my boat at least 6000 miles a year, spending a couple grand and countless hours wrenching, ebaying and tuning to convert to EFI would have cut into my FWF time....

That's why I went with a Carb.

Ya know, when you put it like that, it makes for a strong case to slap a 2116 on it, throw on one of my carbs and leave TBI a later day.  Maybe I'll throw in a O2 sensor with a gauge just to help with tuning.

[beatty97]

I've had carbs and TBI. 87 355 TBI 4speed 4x4 . 84 355 Holley 750 4speed 4x4 the 84 always got better milage and had way more power

[TexasRed]

There is just simply not enough time in my life to do the things I "want" to do.
Family, Work and Fishing are at the top of the "need to do" list...
I pull my boat at least 6000 miles a year, spending a couple grand and countless hours wrenching, ebaying and tuning to convert to EFI would have cut into my FWF time....

That's why I went with a Carb.

Ya know, when you put it like that, it makes for a strong case to slap a 2116 on it, throw on one of my carbs and leave TBI a later day.  Maybe I'll throw in a O2 sensor with a gauge just to help with tuning.

If it were me, I'd carb it. You could get a q-jet built for it too so you'd be within so close to fuel injection, it ain't even funny. The question is would you rather wrench or drive? If you were screaming down the track trying to win a race, it would be worth the extra time to dial in fuel injection.

Also for manifolds: http://store.summitracing.com/partdetail.asp?part=SUM%2D226018&autoview=sku

if you running your holley spreadbore or a qjet: http://www.starperf.com/tabloid/page_57.htm   professional products