4-cyl HEI in GM Autos?

[Clare Snyder]

Garfield wrote:
> 
> On Wed, 26 Nov 1997 22:39:04 -0500, Clare Snyder <clsnyde at ibm.net>
> wrote:
> 
> >Hey gar, there is another way round all this, but a bit of work. Get an
> >8 cyl HEI dizzy and grind every second tip from the reluctor. Fill every
> >second hole in the cap with epoxy - and just make sure you fill the
> >right half. Machine the case to fit the (soob) application and install
> >the proper drive gear. This way you can use an early Mech advance HEI
> >system and not worry about the advance curve - just change weights and
> >springs till you get it right!!
> 
> Yeah, I should have explained more my agenda here. I'm not looking for
> this kind of module to swap with something else or even use in an HEI
> dizzy. I'm looking for a module that can give me a very basic, dirt
> simple advance ramp INSTEAD of mechanical advance.
> 
> Just pretend I'm making my own dizzy with NO centrifugal nor vacuum adv.
> mechanisms, just a mag pickup and a spinning rotor and a cap (sorta like
> an HEI dizzy, but without the coil upstairs), and yet I DON'T wanna HAVE
> to need an ECM to give me a primitive electrical equivalent of
> centrifugal advance. Seewhadamean? That's what I've got when I
> disconnect the ECM from my '83 V6 GM HEI dizzy, presently.
> 
> But, I can't use the 6 cyl version module that I have on my GM car, on a
> 4cyl engine, cause the advance wouldn't likely be right.
> 
> So that's my quest, a module for a 4 cyl car that has a rudimentary
> advance ramp built-in. Anyone?
> 
> Garfield

Why would the advance be different? It is X number of degrees, period.
The six cyl unit should work just fine. Even an eight should work. Check
with NAPA, you will likely find the same module used on the 305 and the
4.3 carbureted engines. Mabee even the same on 4.3 and 5 litre efi.
Take your 6 and a timing light, and check the advance curve with the ecm
disconnected. Does the advance slowly advance, or does it jump?
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