Just pulled the spark plugs in my new to me 440 and they are not the same size as the ones I got to replace them. What are the chances?

[pnora]

Thanks so much for help and explanation! If I do go with the RV12YC do you recommend gapping them at .035?

Looks like they come pre-gapped at .04:
CHAMPION 406 Spark Plug | Shop Now at RockAuto

.035.

 

[Vaanth]

Thanks so much for help and explanation! If I do go with the RV12YC do you recommend gapping them at .035?

Looks like they come pre-gapped at .04:
CHAMPION 406 Spark Plug | Shop Now at RockAuto

Unless you have a non stock higher energy ignition such as a multi-spark or capacitive discharge ignition, gap them at 0.035".

Pre-gapped plugs should always be checked anyway to either reset to a different value, or ensure they are what is desired as they can can get knocked out of the specified setting in shipping and handling.

 

[khryslerkid]

Thanks so much for help and explanation! If I do go with the RV12YC do you recommend gapping them at .035?

Looks like they come pre-gapped at .04:
CHAMPION 406 Spark Plug | Shop Now at RockAuto

There's only four left unless you already ordered them.

.035 is good