[Gmecm] Chevy 350 Carburated to TBI / TPI?

[Aphelion79]

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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>>     
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