[Gmecm] Chevy 350 Carburated to TBI / TPI?
aphelion79 at cox.net
Sun Jan 7 23:31:16 CST 2007
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?
> 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
>> 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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