Thread: road demon carburator

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Hi, I'm trying to install a road demon carburator in a 327 chevy engine. I'm mounting it to an edelbrock performance manifold. How do I hook up the vacuum hose? Will all the PCV valve, brakes and trans hook up to the one hose in the back of the carb?? Appreciate all advice!

All Road Demon carburetors have three
vacuum sources on the baseplate that can be
used for PCV, distributor vacuum, diagnostics,
or any other vacuum operated accessories. The
large fitting on the back of the baseplate, and
the second fitting of the two small fittings on
the side of the baseplate, are direct (below the
butterfly) manifold vacuum sources. The front
small fitting on the side of the baseplate,
opposite the throttle linkage plate, provides a
ported (above the butterfly) vacuum source. Be
sure all vacuum lines are connected or plugged
before you attempt to start the engine.


The port at the rear of the baseplate is intended for a secondary manifold vac source as in PCV and brakes. However, I would not recommend running brakes and PCV off of the same port. Find a direct manifold port for the brakes if you can.

The smaller ports on the side are for ported and direct vac sources. The port in the front is ported for time advance with throttle application and the rear is primarily used for diagnostics, accessories, and distributors that require full time vacuum advance.


If you experience heating up issues at idle, then you may need to run the full time advance on the distributor.

thanks a lot!! Can I T off the back one for my brake and power glide? i'm new at this,lol.

Look on the intake behind the baseplate and see if there is a plugged source there. If you are going to T. That way you can reserve the carb port for the PCV valve. If not then you may not have a choice. Most intakes offer a "straight from the manifold" vac source. If it were me, thats where I would T off.

thanks again, you've been a great help!