This is topic Spark plugs in forum Tech Talk at Northern California Ford Owners  .


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Posted by ALL STOCK LX (Member # 9635) on :
 
Just put some trick flow heads on my 91 fox and now my spark plugs are black and preventing spark. Does anyone know what that means and what's the best spark plugs to go with
 

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Posted by 89bluenotch (Member # 7454) on :
 
I usually just use the cheap autolites 3924's i believe
 

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Posted by ALL STOCK LX (Member # 9635) on :
 
That's the plugs I'm running but don't know why they are black
 

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Posted by Adam5.0 (Member # 6995) on :
 
running rich. check for vacuum leaks
 

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Posted by carlos604 (Member # 6180) on :
 
what are they gapped at? they need to be at 35-40 but double check their website or call their tech line....
 

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Posted by ddarkslayer (Member # 10688) on :
 
whats your compression ratio now since you swapped the heads. 54 is the gap rating used for the stock E7 heads
 

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