On Thu, 2 Nov 1995, Jacob Shaun Dustin wrote:

>... on simple to maintain and diagnose powerplants).  There's a line 
> leading from the driver's side heat riser pipe to the manifold at the 
> base of the carb.  I haven't seen it yet, but he says it looks stock. 
> Any ideas as to what this might be?  
> 

It might be part of the exhaust gas recirculation (EGR) system.

Mike