Can someone tell off the top of their head which CHT I need for 13B spark plugs?  Spruce sells 10, 14, and 18 mm and I'd really like to get a Spruce order in and am feeling a bit lazy and not really wanting to head out to the hanger and measure and then convert one to metric...

 

Thanks. 

 

Doug Lomheim

(Attempting to keep the list active while all our bubbas are having fun at Tracy's :))