Re: [Classic Mustang] Re: 65 mustang speed issue...

There is normally only a "flapper" (actually, Heat Riser is the name)
on one side. The idea is to inhibit exhaust flow on one side with the
resultant back pressure forcing the exhaust to flow through the intake
manifold crossover passage.

... since I'm in California, I have mine safety wired OPEN so it can
never get stuck CLOSED.... we also rarely need the choke to work .... 8-)

Walt
----------------
Jim Lewis wrote:
>
>
> Also......as far as clogged exhaust, you might want to check the
> flapper valves in the exhaust manifolds. These have a spring on them,
> that acts like a thermostat that opens the valve once the engine warms
> up. When cold, these valves are closed, supposedly to help it warm up
> quicker. I've had headers on mine so long, I can't remember if both
> manifolds have them, or just one. I "think" both do, so you might want
> to check and see if they will move by hand. Sometimes they rust, and
> will not work. On the rear of the manifold, you should see a spring, and
> a counter weight that you can push on to see if it will move. If not, it
> could be rusted open or closed (usually closed). Maybe not your problem,
> but worth a look see at least. We used to wire them open, just to keep
> them from rusting closed. Just a thought. Have a good one.
>

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