GM HEI computer control

[Don.F.Broadus at ucm.com]

Thank you very much for the info I will give them a call, I'm looking
forward to this project.

 
Thanks again   Don 



	-----Original Message-----
	From:	Fran and Bud [SMTP:quest100 at gte.net]
	Sent:	Monday, December 07, 1998 1:18 PM
	To:	diy_efi at efi332.eng.ohio-state.edu
	Subject:	Re: GM HEI computer control

	Don,
	I think Howell Engine Developments can help you fit a TBI to your
Pont.
	(Told the same thing to an earlier post, week or two ago) They have
a cast
	adapter that is used to put SBC or even BBC TBI's on various Jeeps,
motor
	homes, etc.   

	Their adapter is a two piece unit that places the TBI bores over the
Q-Jet
	primaries rather than over the secondaries like the plate that comes
with a
	Pro-Jection, so that rear of throttle plate(s) dumps near center of
manifold
	opening rather than at rearmost edge of secondary opening.  

	Most, or at least many, manifolds have a dimension across the
primaries
	(outside to outside) that is similar to a Holley square
opening,(about 3 5/8
	in. as on a Torquer) while the equivalent dimension on a SBC TBI is
4.0 in.
	(4 3/16 in.+/- on a BBC TBI).  The Howell bottom plate,is about 1/2
in thick
	and tapers the 4 in dimension to the 3 5/8, when needed. (some
aftermarket
	manifolds have a thick/wide mounting surface around the primaries
that can
	be ground out to do the same thing, but many manifolds have only a
thin, 1/4
	in. or so, outline at the primaries and cannot accept a 4 in.
opening.  You
	can get the same effect by turning a Holley to Q-Jet carb adapter
($1 to $5
	at most swap meets) upside down and backwards - that is square side
down &
	Q-Jet secondaries opening on top and forward. The Howell piece also
provides
	a balance slot between the two bores, much like a milled center
divider in
	the manifold.

	The other piece,also cast aluminum, adapts the forward mounted TBI
to a std.
	4bbl Holley intake bolt pattern.  

	It would certainly be worth a phone call to check it out,
particularly if
	you dont have anyone with a milling machine. (if you do find
someone, dont
	try to mill a 3 5/8 in. square hole unless he can also weld). A
couple of
	carb gaskets, (Q-Jet and Holley square), will help to visualize this
and
	make sense of what is otherwise just words.

	Howell is at:
	Howell Engine Developments
	6201 Industrial Way
	Marine City, Michigan 48039
	(810) 765-5100  Phone
	(810) 765-1503  Fax 

	Bud
	 
	----------
	>From: Don.F.Broadus at ucm.com
	>To: diy_efi at efi332.eng.ohio-state.edu
	>Subject: RE: GM HEI computer control
	>Date: Mon, Dec 7, 1998, 3:21 PM
	>

	>I would like to use the stock Q-Jet intake 1967-72 but I would
think the top
	>would need to be milled out like a torquer intake, and I don't have
any one
	>that can do that. The reason I suggested a 1980-81 301 distributor
is that
	>it a drop in. If a 77 HEI is modified  The advance mech. will need
to be
	>locked at zero or locked advanced, I  don't know which one it is.
Good luck
	>with your project .
	>
	>
	> -----Original Message-----
	> From: Jim Yeagley [SMTP:jimyeagley at stratos.net]
	> Sent: Monday, December 07, 1998 7:54 AM
	> To: diy_efi at efi332.eng.ohio-state.edu
	> Subject: Re: GM HEI computer control
	>
	> <<Hello Curtis, fellow Pontiac fan. The only HEI that we can use
for
	>Pontiac
	> EFI is one from a 1980-81  301 engine. Look for the 4 wire
connector
	>, pull
	> the rotor off and as Bruce said there won't be any advance weights
	>or vacuum
	> canister. I plan to EFI a 1973 350 Pontiac using a 2BBL intake
	>modified for
	> TBI.>>
	>
	> Funny you should bring up Pontiacs.  My plans are for EFI and an
	>overdrive
	> trans in my '75 Grandville.  TBI will be my choice, as I'll have a
	>friend
	> machine me an adapter for the stock 4 bbl intake.  I also had the
	>question
	> of the distributor, so this thread is of great interest...
	>
	> Jim Yeagley
	> Member:  www.indyram.org
	>
	>
	>