spark plug indexing

[flyinlow]

Any observed power increase on a 440 by indexing standard spark plugs?  What direction do you put the ground electrode?

[Troy]

I usually put that end inside the engine.

Gap should face the valves. One place will say slightly toward the exhaust valve and another will say towards the intake and another will say directly between - but always towards the valves.

http://www.fordmuscle.com/archives/2000/07/indexplugs/
http://www.hubgarage.com/mygarage/summitracing/blogs/10030

Some reference material mentioned here:
http://speedtalk.com/forum/viewtopic.php?t=5093

Troy

[flyinlow]

Thanks.
I have the headers off now, switching to ceramic headers and having the steering box redone, so I will give it a try.

[A383Wing]

I doubt you will notice anything by indexing the plugs on a street engine

[firefighter3931]

I doubt you will notice anything by indexing the plugs on a street engine

and to add to that the only reason most race guys bother with indexing is for clearance when using a domed piston.


Ron