Blue Thunder intake, heat riser block off.

351c-4v Blue Thunder (Shelby) intake manifold.

Here is how i blocked off the exhaust heat risers.
Only one side showed in pics, both sides closed.

I used aluminum mesh and sealed it with chemical metal.
You can block it off with a thin piece of sheet metal like a piece of a beer can.
Also you can weld it.

The reason to do this is to hinder hot air to warm the intake manifold.

By doing this you get cooler and denser air to your motor, more power.
The downside is that it will take a little longer to get motor to working temerature and if you still have the carburetor with the choke tube attached to the manifold it wont work with this modification. You need electric or manual chocke instead.

For a car used only in summer time the heat riser isnt needed.

If i will regret it its easy to open up the block off.

Aluminum mesh

Chemical Metal

Blocked off, just some sanding required.