According to the shop manual you should be able to blow through the valve only
in one direction. Page 65 1986 through 1991 Haynes.

Paul Lamar

BTW The vote is shifting towards the old way :)

Al Gietzen wrote:

Are you sure those are one-way air valves?   My understanding is that the
nozzles were connected to the intake manifold, and that there is simply a
diaphragm in there, the purpose of which I have no idea.  I cut the
diaphragm/valve part off on my 20B and sealed the holes with J-B weld.  I
found that I could not blow through the part I cut off in either direction;
for whatever that tells us.

Al

In addition to that all engines past 1989 or thereabouts had a separate air
supply
that fed air to the metering nozzles through one way valves mounted above
the
nozzles. No telling where this air came from and or its pressure.
Paul Lamar

 
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