01-15-2009, 08:54 AM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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The coldest plug will only be needed in a consistant WOT track situation. Find the series plug for your heads and if they are an Aluminum head, start with 2 steps colder than the recomended (from head manufacturer) plug. It is very easy to get TOO cold of a plug installed. If Iron heads, 1 step Colder. Keep an eye on them initially. This compression is not extreme by any means. Like it or not, 99% of your running is with the throttle plates "barely cracked" 
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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