NGK Spark Plugs..

**SS427** · #1 04-06-2010, 10:32 PM

All the finish dyno pulls we have made on the LS6 motors were using NGK and there was a noticable improvement over the stock plugs. Once the dyno pulls are made I reinstall the AC plugs for correctness.

**markjohnson** · #2 04-06-2010, 11:43 PM

I really don't remember why I even tried them (even against my own father's advice!) but I've always had really good luck with the Champions in my closed-chamber LS-6. I'll have to look at the number of them because I can't remember right now, but there's a way to change a digit or two in the plug # to revert down to a 5/8 plug from that giant 13/16 plug. That really made plug changes a little easier especially on a car with headers. If anybody's interested, I'll get the numbers.

ORIGLS6 · #3 04-07-2010, 12:51 AM

Trivia question: AC is an abbreviaton/acronym for?

Answer

TDW · #4 04-07-2010, 01:21 AM

Without looking at the answer...Albert Champion.

Andy · #5 04-07-2010, 01:43 AM

I used to run strictly AC plugs. After reading Toms's posts about NGK plugs I gave them a try because I was having a miss at cruise rpm in my new 406. After putting the NGK plugs in it, I've had great results. The engine runs so much better. I have since put NGK plugs in everything else I own and I noticed a performance/drivabilility improvement in each vehicle. Whats great about it is that they are only $2. I have an auto restorer magazine at home that I recently got in the mail and they did a comparison on 12 or so different spark plugs. They ranged in price from about $1.50 to $12.00. The regular NGK plugs won the contest.

The next time I go home I'll try to scan the article in so everyone can read it.

Keith Tedford · #6 04-07-2010, 04:37 AM

I have one box of the old AC43N plugs left and will keep them for the COPO engine. I'll have to try the NGK plugs from now on in the 396. I used them years ago in my snowmobiles when the Bosch plugs just didn't work. We didn't need to carry spare plugs after that.

67 442 · #7 04-07-2010, 05:03 AM

I used NGK plugs in my 67 442 and it was night and day compared to the AC plugs I was using. They really woke up the motor. Very inexpensive hp increase.

**JimL78** · #8 04-07-2010, 05:09 AM

If anyone is looking for pretty near an exact copy of the AC 43N in NGK the number is B7ES. I've been running them for a couple of years and have had terrific luck with them.
Jim

Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars.