Side gapping the plugs

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1slickRED89

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autolite racing plugs come with cut-back ground straps stock. an added benefit is that the metal runs cooler. they will wear out quite a bit faster though, maybe 6x as fast.

not really worth it though, those XP103 are way better than a non-fineiwre tip with a cutback ground strap.
 

AREA 91

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Old racer's trick. My dad used to run a drag racing track in New York. He remembers guy's completely cutting off the ground straps on the spark plugs. They would push the car into the water box, fire it up, burn out, and stage very quickly. The plugs would only last that run, but it would produce a hotter spark.
 

nik97

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Anyone try indexing their plugs? Pointing the tip of the ground electrode towards the exhaust valves... Supposed to create a more efficient burn...
 

JustinSane

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yeah i also have used plugs like that in my old nova, they was good plugs for lots of NOS they would light up about any thing , however they wore out faster then normal plugs, but they would last about a season so it was worth it.
as far as indexing goes we also do that on most our drag car motors, what it does is makes sure the spark isnt shrouded from the strap in any way, you get the indexing washers and mark where the strap is and when you install the plug you want the open space facing into the chamber. i will admit we havnt seen any major help in doing this however my dad is old school and is stuck in his ways.
 
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1slickRED89

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you get the indexing washers and mark where the strap is and when you install the plug you want the open space facing into the chamber.

I would advise caution using these washers. these washer make the plug run hotter because they interrupt the heat path. the ones to look out for the most are the steel ones. if your heart is set on indexing the plugs the best way to do it is to buy more than you need and sort for the desired orientation.

to find the best orientation look for the brown spot on the ceramic tip, that marks in which direction the "wind" is blowing in the chamber during combustion. you would want the wind to blow from the side of the plug so the flame kernel is not blown into the sidewire, which will cool it down. using that logic there is only a 50-90 degree window you want to avoid. it will not make a difference that you can feel though, kind of a waste of time.

some race motors need to have the plugs orientated a certain way so that the piston dome will not hit it, that's a different story though.
 

St Louis SHO

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The major negatives to doing that is:

1. Spark plugs will wear out faster
2. You will be super stressing the DIS and coil pack (from the increased voltage to fire the plug)
3. With the spark system on these, you are likley to detonate (and from what I've seen of the rod bearings, these motors already detonate bad)

Just my .02
 

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