the rc12yc5 has an extended gap for newer applications
I was wondering the same thing this afternoon
The RC14YC in a hotter plug.
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GAP .030"
no
Yes
The only difference is the "S" has a tapered seat, the "C" has a gasket and joint seat. Won't seal correctly if you don't use the correct one.
your dum
Rc12yc
A champion RC12YC spark plug is 14mm thread diameter. The torque for this size is 18-22 foot-pounds (25 to 30Neuton·meters)
yes
I have interchanged them and it seems to work. Everything is the same apart from the hex wrench. The hex on the RN12YC is 13/16" (20.6mm) and on the RC12YC it is 5/8" (16mm).