[Gmecm] Chevy 350 Carburated to TBI / TPI?
jay at vessels-clan.com
Sun Jan 7 17:37:08 CST 2007
No need to swap heads. There are several options for the TBI-specific
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.
1982 Chevrolet S-10 Sport, 2.8V6 TBI
1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI pending)
> 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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