<VV> Spark Plug Gap size question

[Bob Gilbert 1]

Hi,

This is a generic question about spark plug gap size.

 

For a given motor, Corvair or otherwise, with everything in good working
order and a good ignition system, what is the impact of running a smaller vs
a larger gap size, say for arguments sake .030 vs. 035? 

 

Some of the things that come to mind include:

 

Does it impact fuel economy?

Does it impact  torque?

Does it impact max RPM?

What do race cars have - wider or narrower gaps?

Does spark plug gap size matter when the vehicle is under load?

 

Overall, does it really matter as long as a "good" spark is produced?

 

Thanks in advance!

Bob

Corsa 180 turbo convertible

UltraVan with 3.1, 4 barrel