Best plugs????
 

What are most of you guys with big power running as far as plugs go? I hear alot about NGK but I am not sure if its just alot of hype.....

Ngk...bcpr7es

what does the c mean?

Correct !

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!

Raced with NGK or years but be careful,last year they sent me plugs for a 200 hp outboard two stroke? I run the 6s. BOB

Thanks guys...I guess what I have heard about the NGK's are true. Time for a new set of plugs!!!:D

I run the R6574-7 in the Chevelle and 8's&9's on the juice. Also ran the 8's in the blower motor in the Scarab.

I like the R series there shorter and are the Race series.I was told there hand assembled also.

Local auto store or any special site???

Rob, would these work on a procharged 509? Is that a colder range than stock and what gap for a stock ignition?