[Gmecm] Chevy 350 Carburated to TBI / TPI?

[Jay Vessels]

Hi there!

Here is the adapter on the FTP site:

ftp://ftp.diy-efi.org/uploads/tbiadapter.jpg

Or, if you can handle the file as a drawing:

ftp://ftp.diy-efi.org/uploads/tbiadapter.dwg

Jay Vessels
1982 Chevrolet S-10 Sport, 2.8V6 TBI
1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI pending)

Aphelion79 wrote:
> Ok, well I guess it is best to look at adapters then, I'll check the 
> website and see if I can find that schematic you spoke of earlier guys....
> 
> Chris Reynolds wrote:
>> TBI was not introduced until 1987 on Fullsize trucks with V8s.  That 
>> means that all of them had the later style "High Swirl" heads on 
>> them.       You can however often find the 454 TBI adapter used on the 
>> early 454s for a song.
>>
>> Aphelion79 <aphelion79 at cox.net> wrote:
>>   Whoops, to finish that... so at the Junkyard look for a TBI'ed 
>> truck, latest model being a '86, for the whole setup... anyone have 
>> pictures of the differences or is there some big obvious thing I could 
>> notice?
>>
>> Aphelion79 wrote:
>>  
>>> Yeah, depending on prices of the adapters (compared to prices, if I 
>>> can find any, of some junkyard intakes for the correct years) I'll 
>>> probably go that route... The engine is brand new with less than 300 
>>> miles on it... so everything about it is currently in near pristine 
>>> condition last time I checked...
>>> Jay Vessels wrote:
>>>    
>>>> Hi there!
>>>>
>>>> No need to swap heads. There are several options for the 
>>>> TBI-specific intake:
>>>>
>>>> 1) Grab an adapter to bolt the TBI to an existing 4bbl. intake. 
>>>> Holley, etc. make them, or make your own -- there is a drawing on 
>>>> the GMECM website's incoming directory somewhere.
>>>>
>>>> 2) Grab a stock TBI intake from a mid-80s fullsize truck. These are 
>>>> likely to be hard to find, since by '87 GM went to centerbolt valve 
>>>> cover heads which have a different angle on the four center intake 
>>>> bolts.
>>>>
>>>> 3) Grab an intake from a newer ('87-, but not Vortec) car/truck 
>>>> (i.e. F or B body, or fullsize truck) and redrill the center 
>>>> boltholes. I've done this but do not like it at all. Getting the 
>>>> bolts drilled right isn't fun, and I made special washers to sit 
>>>> under the bolt heads to make sure there was enough surface for 
>>>> clamping. Personally, I would not do this again.
>>>>
>>>> 4) Buy an aftermarket intake for a TBI and older heads. Holley 
>>>> 300-49 is a choice.
>>>>
>>>> If I was on a tight budget or if I had a really nice intake, I'd do 
>>>> #1. I might do #2 if I got really lucky in the salvage yards. 
>>>> Otherwise, I'd do #4.
>>>>
>>>> For TPI, it's a similar issue. 1985-1986 baseplates will bolt to the 
>>>> heads you have, but after that they're designed for centerbolt 
>>>> heads. These may be easier to modify, or mix-and-match 
>>>> runners/plenum/baseplates based on what you dig up.
>>>>
>>>> Jay Vessels
>>>> 1982 Chevrolet S-10 Sport, 2.8V6 TBI
>>>> 1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI pending)
>>>>
>>>> Aphelion79 wrote:
>>>>      
>>>>> Is this possible? I have a 79' Chevy C20 sitting in my back yard 
>>>>> with a carburetor that sucks. About 300 bucks for a new one... so I 
>>>>> was wondering can I take the head off of a newer model truck with a 
>>>>> 350 and TBI (or off a car with TPI) from the Junkyard and if it 
>>>>> will bolt on directly without any problems?
>>>>>
>>>>>
>>>>> *I realize I also need the wiring harness and computer (I've done a 
>>>>> few FI swaps on vehicles already, but this one seems to be the 
>>>>> easiest looking like everything will bolt right on...)
>>>>>         
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>>>>       
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