Re: Running a 305 with '747

["Jeff Flanary" <jefff@mounet.com>]

Correct me if i'm wrong, but i used a 747 from a 4.3 astro in my S10 w/305
TBI, all i did was put a 305 TBI prom from a fullsize truck, and got a
calpak from the same and put it in the ecm.  It runs fine.  Jeff


----- Original Message -----
From: "Kurek, Larry" <lkurek@anl.gov>
To: <gmecm@diy-efi.org>
Sent: Monday, May 01, 2000 3:04 PM
Subject: Running a 305 with '747


> All:
>
> I am considering swapping a 305 motor into my 87 Astro van. It currently
has
> a 4.3 TBI setup on it, and I am debating what system to run on the 305. It
> currently has a TPI setup on it, but I don't feel like wasting that system
> on a minivan :)  So...I have a complete TBI setup off a 1500 truck (747),
> which as I can see...is pretty much plug and play with the Astro wiring
> harness (granted, a couple of repins...but no biggie). The biggest thing I
> see, is recalibrating everything to run as an 8cyl vs a 6. Easiest thing
> here is to run the 747 ECM rather than the Astro's. However, the 747 is
> calibrated for a 350. What, if anything, should I do to run this on a 305?
I
> know the ECM will "learn" through O2 feedback, however I'd rather start
with
> a decent calibration that was relatively close to begin with. I was
> considering: A new PROM with a modified cylinder size (easiest?); or a
> ECM/PROM/Cal from a 305 TBI engine (Know of any that would be useful?).
>
> Any help much appreciated :)
>
> Larry
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