I googled some stuff today about spark plugs
sidegapping and indexing
And then whatever rocket does to his plugs
Ive seen dynos from rocket plugs which show good results
And indexing makes sense to me also
But the indexing and sidegapping seem to be popular on domestic forums

does sidegapping and indexing apply to honda motors?

 

I have no idea how well side gapping works in any engine, let alone hondas. I'd love to see proof of their effect.

indexing however I do know about. indexing makes huge improvements in domestic motors because the plugs are usually offset from center in the combustion chambers, and directing all the gaps towards the center of the combustion chamber creates a better burn, and definitely makes the burn among all the cylinders much more consistent.
in honda motors, the plugs are typically right in the center of the combustion chamber, so the effects of indexing will not be anywhere near as big. there is still a slight difference though. But, that difference will be different among different honda motors regarding which way to face them, and how much of an effect it actually has. best way to know is on a dyno through trial and error

 

what about sidegaping and indexing a set of rocket spark plugs lol

3 is surely better than one trick