Thread: SPARK PLUGS
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  #9  
Old 06-09-2004, 07:40 PM
Phatcat Phatcat is offline
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Join Date: Jun 2004
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What about using the HEI on a 400 with the high compresion heads? (code YD) Will I see any benefit. My car doesn't run well on regular but gets by on midgrade.

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