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Old 06-05-2007, 12:20 PM
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Originally Posted by kennyo
Rob, would these work on a procharged 509? Is that a colder range than stock and what gap for a stock ignition?
Steel heads,stock is 5-6 I ran 8's in my scarab that was 800plus hp on 93

the 8's in my Chevelle are to cold on the street,fine on the juice

in the ac plus I am running a 42ts in the Hustler, they could all most run a 41 but might load up a little in the no wakes.and there cheap


the boat and car I run .032. The car just running on the street i open em up some.

Dustin Whipple recomended the NGK R5674-8 on the Hustler,I havent tried them yeat the ac 42 is what we dynoed with all the way up to 11.5 pounds of boost and are working fine
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Old 06-05-2007, 12:32 PM
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Originally Posted by Strip Poker 388
Steel heads,stock is 5-6 I ran 8's in my scarab that was 800plus hp on 93

the 8's in my Chevelle are to cold on the street,fine on the juice

in the ac plus I am running a 42ts in the Hustler, they could all most run a 41 but might load up a little in the no wakes.and there cheap


the boat and car I run .032. The car just running on the street i open em up some.

Dustin Whipple recomended the NGK R5674-8 on the Hustler,I havent tried them yeat the ac 42 is what we dynoed with all the way up to 11.5 pounds of boost and are working fine
Thanks, i'm running the 43t's. The 42's loaded up at idle and fouled. Is the ts the extended tip? Does that help?
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Old 06-05-2007, 12:38 PM
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I am running the ac R43XLS and am happy with them but was thinking of going 1 range hotter. What would i use if i went with the NGK's?

What does the XL stand for?

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Old 06-05-2007, 12:50 PM
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Originally Posted by kennyo
Thanks, i'm running the 43t's. The 42's loaded up at idle and fouled. Is the ts the extended tip? Does that help?

The extended tip helps on keeping the plug clean.but if ya are close on the tune up itall get the tip,

The procharger set up has high fuel pressure ,I think they just add pressure instead of doing it in the map,Smitty knows more about them.
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Old 06-05-2007, 01:47 PM
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Originally Posted by hunster
I was on the phone with the tech at ngk and was looking for a colder plug than stock. trying r5673-7 non resistor racing plug. Can't find any info on them!
That is the same that we ran in our A-class and SVL raceboat. I still use them in my 540. I just had a local auto parts store order me a set - $1.69 each.
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Old 06-05-2007, 05:51 PM
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Originally Posted by hunster
bc = 14 mm 5/8 jis type ( whatever that means)


p = projected tip

r = resistor

7= heat rating 2-12 2=hot 12 = cold

e = 19mm reach

s = standard electrode

I was on the phone with the tech at ngk and was looking for a colder plug than stock. trying r5673-7 non resistor racing plug. Can't find any info on them!

I think the 3 is a non projected tip??

I have some r5673-10 they sent me back when we were doing the street car shoot out stuff. I didnt even try them they were so cold
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Old 06-06-2007, 09:38 AM
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So is the colder better? I use NGK R5673-8 in my 525sc sould I stick with these or use something else? I no nothing about plugs......
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Old 06-06-2007, 09:41 AM
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I run the ngk 8's in my boat
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Old 06-06-2007, 09:54 AM
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so when you say 8's you refur to the last number then?

(I no nothing about plugs......)
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Old 06-06-2007, 11:12 AM
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Is there any reason to run a resistor type plug in a carb motor? I have the Crane ignition box, and it says for optimum performance run a non-resistor plug, but when RF communications and navigational equipment is used to use a resistor type plug.

Will a handheld GPS cause that much interference with the ignition box?

What are most of you guys gapping your plugs to?
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