RN12YC Champion Spark Plug Gap?

[nsmall]

RN12YC Champion Spark Plug Gap?

Any idea of the proper gap on these plugs?  I have 340.

THANKS!!!

[RUNCHARGER]

.035.

[nsmall]

Thanks Runcharger!

[HP_Cuda]

yup 35

[Roadman]

                     I agree on .035.  However if your using aftermarket ignition, like MSD, etc. you should follow their instructions. And if your motor is running higher compression that stock it can be a consideration.   

[Brads70]

Funny that's the same plug used in Briggs snowblower and lawn tractor engines. I keep them in stock on my work van. I've always used NGK? Good to know I could use these if I wanted.

[jimynick]

If you've got an aftermarket CD type ignition, you could open it to .040" and get a wee bit bigger spark kernel. GM HEI's ran up to .060" if I recall right.   

[Roadman]

If you've got an aftermarket CD type ignition, you could open it to .040" and get a wee bit bigger spark kernel. GM HEI's ran up to .060" if I recall right.   

                                            Several variables have to be taken into consideration. 

[Chryco Psycho]

With a high output coil I will set at .040 wider just gets hard on the ign wires

[nsmall]

@Brads70  ol Chryco Psycho gave me the lead on these Brad.  I have stock Mopar ignition and fairly stock compression so I will use the .035 gap.  Thanks