I currently run NGK R5671A-8 and -9 V-Power plugs and wanted to try and run some Champions. I'm having a couple of issues with the NGK fouling and wanted to see if the issues are the same with the Champions at a different heat range. I called Champion and they can not cross reference the NGK plug.

Does anyone know the Champion number? I have a 540 BBC with iron heads (14mm thread, 19mm reach, 5/8" hex, gasket seat).

I have tried sparkplugs.com and it was no help.

Thanks

I have found NGK tech support to be very knowledgeable in the past always coming up with a good plug for my setup.

Technical Support
hours: 8:30am - 5:00pm Monday-Friday EST
tel: 1-877-473-6767 prompt #2

VegasHallett,

C 59 C(X).....A-9
C 61 C(X).....A-8

Bob

Thanks,

Bob

I wouldn't run Champion plugs in my lawn mower. We stopped using them in the 70's. If you want to try a very good plug run Autolite AR Series. They have a cut back ground strap which will produce more HP. Are you Super Charged? If your not your running way too cold of a heat range.

Champions stink. I have had brand new champions foul out almost instantly in engines before. They simply stop working. Then replaced them with NGK, and they work perfectly. Never again. BTW I had two Autolites comletely blow the ceramic centers out of the plug on my ski boat last year. Gladly replaced with NGK's. I'll stick with what works.


Darrell.

50 ngk spark plugs on the shelf no champions

Which Autolite AR would you run in Dart 355 CNC heads, supercharged?