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Original Message
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Rf12yc |
By Cobra428 - 10/17/2005 4:06:44 PM; IP 66.136.159.157 |
I have a 428 with aluminum heads, 10:00 to 1 CR estimated 450 HP and have been using RF12YC with good luck. Recently changed to Autolites racing plugs in the same heat range (can't remember the number) and I really like them. |
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