I use them, but a colder plug, they work great.
Yes the 5's are colder plug But they run great and less fouling out.
I just put in NGKs today and it fired right up.
i;ve ran bosch plat 2 prongs for 2 yrs no problems! once I got my arcing wires sorted...
For the stock heads, I recommend the good ol W8AC (Bosch Copper)
I'm running NGK BKR7E plugs, gapped to 0.028 with APR's K04 program and its working fine.
There was a considerable difference when I installed my new NGK plugs. My engine revved up easier and the fuel efficiency increased.
i put a heatrange colder (bosch FR6 because i can't get the ngk's local) in my bro's chipped 337 and it ran a lot smoother
Mine popped up with the NGK's all i did is tighten the spark plug a little more and it stopped.
And I tried both the Bosch and the NGK back to back, and the NGK ran far better than the Bosch. The Bosch were terrible in my case.
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