Champion C-10S Plugs ??

Larry,
They will work very well in the Franklin. They are approved. They only last about 100 hours, however.
For you that's about 10 years or more...hahahaha.
Dan
 
R=resistor
E=Shielded 5/8-24 thread
J=14mm, 3/8 reach, 13/16 hex

Same reach as C-10, anything much longer and you are getting pretty close t the top of the head. I have seen people use REL-37 with 1/2 reach, and maybe if I was desperate, but I'd be watching my EGT/CHT pretty close, 'cause I've never tried them (and I don't think they're approved).
 
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