Re: [AMC-list] BBD Carburetors and HEI--Dist Gear
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Re: [AMC-list] BBD Carburetors and HEI--Dist Gear

What Jim Blair wrote sounds correct. I made this swap in 1999 or so I think. (Where does the time go?) So my memory is not exact. I may have bought a purpose-made distributor gear that fit on the GM distributor. I recall that the distributor gear I used was a tight fit with no wobble. 1999 was a time when many of the AMC cars with BBD carburetors were still on the road, so the HEI conversion had become a sort of cottage industry. I bought my conversion from an online source that had been linked from the old AMX-Files website and list.

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    1. Re: AMC-List--BBD Carburetors and HEI (Jim Blair)


Message: 1
Date: Mon, 15 May 2017 20:27:33 +0000
From: Jim Blair <carnuck@xxxxxxxxxxx>
To: "amc-list@xxxxxxxxxxxxxxxxx" <amc-list@xxxxxxxxxxxxxxxxx>
Subject: Re: [AMC-list] AMC-List--BBD Carburetors and HEI
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You have to be careful when you do the gear swap because the Motorcraft ignition gear has a bigger hole and will wobble on the GM HEI shaft and wipe out itself and the cam gear.

I recall the first year of HEI was '74 on the inline 6 GM motors. 250 and 292 until the last GM inline 6 in '85 or so (I think the G series vans were the last)
    They had an in cap coil and external coil on the same base with different cap/rotor styles and pickup coil as well as harness was different.

From: Matt Shumaker <mshumaker@xxxxx<mailto:mshumaker@xxxxx>>
To: amc-list@xxxxxxxxxxxxxxxxx<mailto:amc-list@xxxxxxxxxxxxxxxxx>
Subject: Re: [AMC-list] AMC-List--BBD Carburetors and

I would jump on this offer.  I ran a BBD with a swapped-in GM HEI on a
1983 Concord with 258 for a few years.  It was my daughter's first car.
The HEI came from a 1979 (I think) Chevy 250 I-6.  I had to replace the
driven gear at the tip of the HEI distributor with the gear that came
off if the Concord's distributor.  The electrical connections were
simple, and they bypassed the computer.  The installation put the BBD
into a kind of an average, all-around driving setting and the stepper
motors were never again operative.  The Concord ran much more reliably
afterward, eliminating the hesitation (and sometimes killing the engine)
on starting from a traffic light.  It passed emissions better with the
HEI and bypassed computer than it had with the original setup.
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