best spark plug for an 8N

Snarfblat · Mar 4, 2015

Quick question... on my 8N ford...ive had ok luck
with champions plugs... then tried autolites with
much disappointment. now ive got the options of
buying motorcraft, ac delco, or NGK this round. What
do yall find to be the BEST or what i need/want that
will hold up longest? thanks in advance.

WW2N · Mar 4, 2015

Autolite AL-437 is what most use here some NGK-3112 are a bit hotter and Made USA last I knew. What is the problem your having, if you are putting in new plugs and having a problem my guess is something else may be to blame and not the plugs. We need more information. Here is a shot in the dark-If you did a tune-up do you have a front mount distributor if you do and you put in new plugs and wires and it runs rough--firing order is 1-2-4-3 it is easy to cross 3 and 4 up on the dist cap. Front mount dist point gap.015- side mount dist points gap .025 But without more information it just smoke and mirrors on our end. Post back.

Tim Daley(MI) · Mar 4, 2015

Original spec calls for Champion H10 spark plug. As stated, many use the AutoLite 437's. I am currently using Champion H12's (512's) and have no issues. Last set lasted 5 years. H12 is a hotter plug very similar to the AL 437. I have used all three plugs and never had issues with any of them. Some say the Champions foul easy but have yet to see concrete data to back that statement up. Opinions are like, well, you know. Also mentioned, the chances are that your problem is somewhere else is 100% probable, but we need more details as to exactly what your having difficulty with. Fouling? That would be a fuel issue.

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maxwell99 · Mar 4, 2015

I use autolite AL3116
Have had good results and long life with these plugs.

But no plug is going to last long if your fuel system is running too rich.

Bruce (VA) · Mar 4, 2015

See tip # 7.

What do the plugs look like when you replace them?
75 Tips

old · Mar 4, 2015

I was using auto lite till they started making them in China so I have since switched to NGK that are the specs of the Auto lite 437s

lha · Mar 4, 2015

I got about 5 years good running from a set of Champion H-10c's. I still have them,as they were still good,just had H-12s ready for a tune-up.NGK is a good plug,as is ND[Nippondenso].

Dell (WA) · Mar 4, 2015

Snarfblat........with todays "no-lead" gas, we've found that the exposed tip of the AutoLite 437's to be more reliable than the original Champion H-10's or the hotter version H-12. Gap is still 0.025. CAUTION: with todays BelchFire-V8's and automatic chokes, many new tractor owners (not used to manual chokes) FLOOD their sparkies. When FLOODED, you haffta remove the sparkies and DRY them. Propane torch works well as does time. ........HTH, Dell yer self-appointed sparkie-meister

jimtrs · Mar 5, 2015

Ummm, While the Autolite 3116 mentioned above are a great plug (I run them in all the Internationals and Farmalls), They will not fit in a Ford N. I use the 437's there.

Autolite 437 has a 14 mm thread diameter
Autolite 3116 has a 18 mm thread diameter

best spark plug for an 8N

Snarfblat

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WW2N

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Tim Daley(MI)

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maxwell99

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Bruce (VA)

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old

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lha

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Dell (WA)

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jimtrs

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