After installing my dual quad set-up I noticed that one of my dual exhaust pipes had more pressure than the other. Could this be a problem?

58 Ford Custom 300 - San Pedro, CA (So-Cal)

Do you have a heat riser valve on one side?  How do you know there is more pressure on one side, did you measure it with a gauge?

John - "The Hoosier Hurricane"

I just noticed it when I went around to the back of the car. I put my hand behind both pipes and noticed one was considerbly stronger than the other.

58 Ford Custom 300 - San Pedro, CA (So-Cal)

Check your heat riser up front where the exhaust pipe hooks to the exhaust manifold. It could be stuck closed or partly closed causing exhaust to go through the intake manifold to the other side. Even try revving up the motor and see if it changes the pressure.

Ol'ford nutCentral Iowa

56 Vic w/292 & 4 spd.

So with dual exhaust should I have (2) control valves (1) at the end of each manifold??? Are these mandatory?? Can I just remove them???

58 Ford Custom 300 - San Pedro, CA (So-Cal)

I just remove it from the passenger side which should be the only one you have. You may have to add a similer spacer without the center flap back in it's place so the exhaust pipe will remain in the same position.

-Gary Burnette-

That makes sense because the passenger side is the weaker side of the two.

58 Ford Custom 300 - San Pedro, CA (So-Cal)

The spacers are offered by the parts houses.

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

If you are going for a master Macs should have the spacer and you need 2 gaskets.

  

To test the back pressure you might consider something we use to do a very long time ago. Take two raw potatoes and stuff them into the exhaust pipes when the car is parked. When the owner started the car the exhaust built up in the pipes and finally BLEW out wih a lot of smoke and noise. Then measure the distance the potatoes travelled and you can compare the pressures. Just a thought for what it is worth.