| [GMCnet] FiTech looks like the real deal [message #292301] |
Wed, 16 December 2015 08:53  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Senior Member |
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Hi Rob,
Yes, an adapter plate is needed since the four square pattern throttle valves do not line up with the two small and two large holes in the top of our spread bore intake manifold. The mounting tab holes do line up so it will bolt on without an adapter, but the throttle valves would not open properly. I happened to use one from NAPA because it was thinner than the one from Holley.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
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Message: 1
Date: Wed, 16 Dec 2015 13:21:14 +1100
From: "Robert Mueller"
To:
Subject: Re: [GMCnet] FiTech EFI looks like the real deal
Message-ID:
Content-Type: text/plain; charset="us-ascii"
Jerry,
Excellent report, THANKS!
One question, is an adapter required to fit the FiTech injection system on the Q-Jet manifold?
Regards,
Rob M.
The Pedantic Mechanic
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] FiTech looks like the real deal [message #292303 is a reply to message #292301] |
Wed, 16 December 2015 09:18  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
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Jerry,
Quick followup on that: Recognizing the difficulty of doing so with the
manifold in place, does it appear feasible to re-machine the OEM manifold
to clear the interference with the butterflies?
Ken H.
On Wed, Dec 16, 2015 at 9:53 AM, Gerald Work wrote:
> Hi Rob,
>
> Yes, an adapter plate is needed since the four square pattern throttle
> valves do not line up with the two small and two large holes in the top of
> our spread bore intake manifold. The mounting tab holes do line up so it
> will bolt on without an adapter, but the throttle valves would not open
> properly. I happened to use one from NAPA because it was thinner than the
> one from Holley.
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] FiTech looks like the real deal [message #292308 is a reply to message #292301] |
Wed, 16 December 2015 10:53 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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According to the FiTech FAQs, the spark control won't work with an HEI distributor. I sent them a note asking if they have future plans to do so - there are a LOT of HEIs out there, and the needed information is available via the plugs to the module. I'd want a knock sensor and timing control to make the conversion worthwhile and it doesn't seem terribly hard to obtain them. Otherwise, the old Holley ProJection system I have in a box someplace will do about as well. Time will tell.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] FiTech looks like the real deal [message #292327 is a reply to message #292301] |
Wed, 16 December 2015 14:39 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Jerry,
Should have added this to my original question:
If an adapter is required does it raise the air cleaner to a point that it interferes with the engine cover or is the FiTech
throttle body "thinner" than the Q-Jet?
Regards,
Rob M.
The Pedantic Mechanic
-----Original Message-----
From: Gerald Work
Hi Rob,
Yes, an adapter plate is needed since the four square pattern throttle valves do not line up with the two small and two large holes
in the top of our spread bore intake manifold. The mounting tab holes do line up so it will bolt on without an adapter, but the
throttle valves would not open properly. I happened to use one from NAPA because it was thinner than the one from Holley.
Jerry
From: "Robert Mueller"
Jerry,
Excellent report, THANKS!
One question, is an adapter required to fit the FiTech injection system on the Q-Jet manifold?
Regards,
Rob M.
The Pedantic Mechanic
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] FiTech looks like the real deal [message #292337 is a reply to message #292336] |
Wed, 16 December 2015 17:52 |
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Loffen
Messages: 1087
Registered: August 2013
Location: Norway
Karma: 1
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Senior Member |
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The adapter plate for the original intake usually goes from 3/4" TO 1", it is different ones out there but I think the ones with the open plenium is mostly used
1973 23' # 1848 Sky Blue Glacier called Baby Blue and a 1973 26'-3 # 1460 Parrot green Seqouia Known as the Big Green,
And sold my 1973 26'-2 # 581 White Canyon lands under the name Dobbelt trøbbel
in Norway
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