[J.Q.]

I discovered that my heat riser on my 1967 Chevelle Malibu is broke. What if any performance issues will I have until I replace it. Also how difficult is it to replace?

Thanks for any/all input:yes:

 

[BigFred66]

Heat riser restricts exhaust flow from manifold when engine is cold.
Is supposed to help heat the choke spring quicker.
When you say "broke"...I'm assuming it's "broke" in the open position.This could/would cause the choke to stay on longer than necessary,resulting in a "rich" condition after the engine is at operating temp.
You don't state as to what engine/carb combo you have...
Manual/automatic choke?

Changing it depends on how crusty your exhaust is!

 

[mike pratola]

Yes but if it's stuck in the closed position it would restrict exhaust flow, the engine wouldn't rev freely and may act rich.

 

[J.Q.]

The engine is a 283 3 speed. The choke is an automatic choke. I don't know what position the heat riser is stuck in.

Thanks for your input