Sparkplug Index

[skidkid]

Are people finding benefits from indexing spark plug in RB turbo engines? Which way are you facing open side of electrode? I have a heap of washers that I am feeling the need to use when I put the head back on our wagon this weekend.

[RB30-POWER]

zoom tested this many years ago on various rb engines at different power levels.

their test revealed zero gain in all situations.

i would not bother myself.