RE: Running a 305 with '747

["Kurek, Larry" <lkurek@anl.gov>]

What year truck had both TBI and a 305 and used a 747 type ECM? I thought
injection was added to the truck lines in 1987, and the only small block
engine available was the 350. Yes? No?

Larry

> 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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