The 403 is more than up to the task. Several of our GMCers tow extreme
loads with no issues. One tows a long trailer with as many as 3 COPO
Covairs on board thousands of miles per year. With upgrades like final
drive gearing changes, they will git n scat with the best of them, and get
better fuel economy doing it. My 403 cruises easily all day long at 65 mph,
or faster if I am in a hurry. Makes 8 - 11 miles per gallon doing it. Don't
be afraid of them, they are very durable. Mine has never been open, and has
nearly 140,000 miles on it. You would be on your third 454 chev by now, if
that was the engine in your RV. But, the 455 Olds is also a good engine.
You can't really go wrong, no matter which one you choose.
Jim Hupy
Salem, Oregon
On Mon, Feb 24, 2020, 5:16 AM Michael Hunt via Gmclist <
> Why not? I would think the 455 would give you more horsepowerxand towing
> capacity.
>
> On Tue, Feb 18, 2020, 11:39 AM James Hupy via Gmclist <
>
> > Many of us feel that a swap from a 403 to a 455 is not an upgrade, not
> even
> > an even- Steven swap. But, we might be a
minority.(GRIN)
> > Jim Hupy
> > Salem, Oregon
> >
> > On Tue, Feb 18, 2020, 4:13 AM Michael Hunt via Gmclist <
> >
> > > Why not upgrade to a 455?
> > >
> > > On Tue, Feb 18, 2020, 1:34 AM roy keen via Gmclist <
> > > gmclist>
> > >
> > > > It is always hard to trust the person doing the rebuild has checked
> all
> > > > clearances and torque values. Using quality parts is another concern.
> > If
> > > the
> > > > original engine had a bearing failure I would never trust the
> existing
> > > oil
> > > > cooler even if it were cleaned and back flushed one tiny piece of
> metal
> > > > could wipe out a fresh engine cleanliness is very important .
> > > > --
> > > > Roy Keen
> > > > Minden,NV
> > > > 76 X Glenbrook
> > > >
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