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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

Re: What could have happened? H12 Plug issue-Dell?

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old

09-29-2013 19:27:11
209.86.226.34



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Well #1 you got champs instead of what most say to use as in auto lite 437s. You do know champs are now made in the land of almost right so yes you got almost right parts




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bfisherman11

09-29-2013 20:57:18
173.20.195.122



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 Re: What could have happened? H12 Plug issue-Dell? in reply to old, 09-29-2013 19:27:11  
The gap on my old AL82's was .025.

I found some AL82F4's, will these work? Sounds like it.

After the issues with the H12's I am worried about trying anything else, even the AL437's.

Bill



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36 coupe

10-01-2013 03:01:02
72.55.254.5



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 Re: What could have happened? H12 Plug issue-Dell? in reply to bfisherman11, 09-29-2013 20:57:18  
Ill repeat.Measure the reach of the old and new plugs.The shorter reach plugs may have been put in the engine for a good reason.J series Champions have a shorter reach.Its a simple matter to compare the reach of the plugs that were in the engine to the H12s.No need for ideas that the plugs are hitting the piston or block.Those who say this dont know that it cant happen in this engine.There was an aluminum High compression head sold for this engine that could be different as to spark plug location.

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greywolf224

10-01-2013 09:36:51
69.27.229.11



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 Re: What could have happened? H12 Plug issue-Dell? in reply to 36 coupe, 10-01-2013 03:01:02  
Quoting Removed, click Modern View to see

I worked on a few Pontiac and Chevy engines in the past. Remove all of plugs and place a short wooden dowel straight down in one of the spark plug holes. Slowly spin the engine by hand where the valve should move the dowel up and down and measure the max and min heights of the dowel. The max height measurement is just beyond the max reach that the spark plug can be without hitting.

Keep in mind your max reach can be different then specs due to:

Milled heads

Thin gaskets

Custom domed valves

Loose valve train.

There is a spark plug adapter called anti fouling something or other that screws into the head and the plug screws into it. It will buy you some reach.

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bfisherman11

09-30-2013 06:45:56
198.41.82.135



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 Re: What could have happened? H12 Plug issue-Dell? in reply to bfisherman11, 09-29-2013 20:57:18  

This is a pic of one of the plugs. A couple were worse.



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