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Best 600 Plugs?

P

phil(va)

Well-known Member
Have 640 that burns a little oil. Not huge, but enough. Calls for H10; someone put H12 in it before, but they are hard to find.
Thinking to go to hotter plug. I like Autolite better than Champion for my Fergusons, but open to suggestions from you guys for this
Ford. Non resistor of course. What say you?? What's my best option in this situation? Thanks.
 
I have given up on Champs and auto lite plug since now days both are likely to come form the land of almost right. Now days I use NGK3112 plugs in my fords and my A/C tractor and they tend to hold up longer and better then the other 2 brands do
 

Champion plugs and Ford engines don't seem to play nice together. I use Autolite or Motorcraft and have good luck with 'em. Never tried the NGKs so don't know what to say about those.
 
Specifically, what number Autolite plug do you use in your 641? I'm looking for a hotter range, but any info appreciated. Thanks. I
am trying the Autolite 437 right now. It is supposed to be equivalent to H14 Champion, but just not sure about it. I would gladly go
to NGK if I knew the equivalent.
 
Phil,Get you some non foulers for your 437 plugs and that will stop the fouling of the ones that foul out till engine rebuild time comes around.
non foulers
 
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