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351C Sparkplug Help!
I did the initial startup of my 70 351C. Fired and ran great within a few seconds of the turn of the key. Then things went down hill. I noticed leaking around the spark plugs. Upon inspection the heads have a flat land at the plug thread and the plugs installed are beveled without a compression seal. Obviously not compatible. Unfortunately 4 parts stores all call out the plug which is obviously wrong... Any help or numbers for the right plugs?
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351C heads use a small (5/8 hex) tapered seat spark plug. Autolite 25
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you can use NKG ur4 stock # 6630 gap at .035
I have no problems with these plugs. Rich |
Straight from Southern engines:
my 4V uses: motorcraft: ASF-42C autolite: 15 or 14 champion: V-12YC accel: 276 gn |
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