identifying a Chevy 350 block and Trans

Gary Derian gderian at oh.verio.com
Fri Mar 26 17:48:01 GMT 1999


EGR can be a good thing on a late model engine that advances the timing when
the EGR kicks in.  It reduces pumping losses and improves economy at part
throttle.  On an old carbureted engine, EGR kills throttle response and
reduces economy.  Those old engines with no electronic controls work best
when the vacuum advance is connected directly to the carb,  ported vacuum is
usually best, and no EGR.

Of course if you have to meet emission standards, you have to hook it all
up.  The EGR valve hooked up to a special vacuum port on the carb that has a
long slot in the carb throat.  As the throttle is opened, more of the slot
is under the plate increasing the vacuum signal as the throttle is opened.

Gary Derian <gderian at oh.verio.com>

> hi. I just bought a jag with a Chevy 350 engine and Chevy trans.
>
> it is a constrained motor with what looks like a single barrel Rochester
and
> those rams horn exhaust manifolds. but I believe the manifolds need to
stay
> there to fit in the engine compartment. The engine might have some height
> restrictions maybe that's why that carb is there.
>
>
> I would like to identify the engine for tune up purposes. Also the egr
valve
> is disconnected, and there are the usual 2-3 plugged up vacuum ports on
the
> carb and manifold. I believe that having a working egr valve is a good
> thing, exactly where was that attached ?
>
> thanks, Ted Stowe




More information about the Diy_efi mailing list