carb "spacer" gasket.application?purpose?advantage?
 

What is the application/purpose/advantage of the carb "spacer" type gasket over the plain single layer thin gasket? I am changing the carb from a walbro to a Kohler Carter # 30 on a K321 engine from a 149,and I am trying to determine which gasket to use.
My K321aqs has the spacer type gasket,but my k241's and k301's have a thin gasket.
Thanks.

I have gone both ways with and without the carb spacer and really didn't see any notable difference. I think the pullers run a spacer and it probably makes a difference on a modified motor. I beleive it has something to do with atomizing the fuel but not 100% sure. Sam Mac will know more about this topic I'm sure.

The "thing" that I have always heard, the spacer helps reduce heat to the carb reducing the possibility of boiling the fuel.

That is the best reason to use the spacer. :beerchug:

the reason for the carb spacer for pulling is because the carb vapour locks and wont run.