[Gmecm] Chevy 350 Carburated to TBI / TPI?
jktucker at usamedia.tv
Sat Jan 13 23:26:28 CST 2007
Well, I believe that your '69 corvette intake will work with an
adaptor to the TBI throttle body. The vast majority of all carburetors
that I know of are either spread bore or square bore, and Holley makes
adaptors for both. In a previous post, somebody mentioned that the
thermoquad carter carburetors were spread bore. The ones I was familiar
with were AFB's, which were square bore. If the secondaries are larger
than the primaries, then you have a spread bore manifold. I do know of
a Rochester carb used in a '65 impala motor that was not spread bore,
but I don't believe it matched the holley square bore pattern either.
Now, if for some reason your manifold is not either square bore or
spread bore, then you can still have a machinist make an adapter. It's
not going to be cheap, but all you need is an aluminum plate made out of
3/4" stock, with the correct bolt pattern on either side. A machinist
should be able to measure a throttle body and your manifold to make a
As far as a recipe book goes for how to make the conversion, I
haven't seen one that really covered it. Most articles I've seen about
it suggest using a painless harness or some other aftermarket harness.
That is definitely the easiest way to do it, and since it supports their
advertisers it makes a lot of sense. I bought the TPI swap book several
years ago, but it really didn't have a lot of useful information in it.
I learned most of what I needed by doing searches on the internet.
If you have specific questions, I'll answer them when I can
help. I have done several injection conversions, including a TBI, TPI,
and two Vortec conversions, and have hit several pitfalls along the way.
I've also installed a couple of Holley Pro-jection systems early on, and
found them to be very disappointing. Careful planning can make the swap
go very smoothly. The other key is to try to get all components from
the same vehicle to avoid any mismatched parts.
Good luck on your project.
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
Behalf Of BNRVL at aol.com
Sent: Saturday, January 13, 2007 9:26 AM
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] Chevy 350 Carburated to TBI / TPI?
Hello Jake , I will use the 350 auto presently in my 33 Dodge truck ,
only has some 3-5,000 since rebuild an works OK . Eventually I will
700 R4 ,with a lock-up torque converter , and another rear ratio , as
present Duster 2:46:1 will not hndle the OD trans. , as I would have to
get up to
75 for it to kick in , so that's no good in the City driving scenerio .
I want to try and use the 69 corvette intake , if possible with an
for the TBI . Do you think this will work ??
I will begin to look for a 1988-92 GM an or Pick-up truck for a donor
vehicle . Pull all parts needed and transfer them to my 33 Dodge Truck
. Do you
think that Walter Chjrysler will object to ELECTRIONICS on a 33 Dodge
up ?? WOW what a great time we all live in today , now if we could just
resolve the crazy Iraq situation and bring our Guys and Gals back home
.Such a gross loss of Lives for those poeple who have never known where
are going or been .
have a nice week-end , and thank you very much for your kind help to
Old Man .
Do you know of a road map for TBI conversion online ??
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