Sorrry I don't think I made it very clear. The higher the number the hotther the plug, lower colder. You want a colder plug not because of engine size but whats in it. You have higher compression and a hotter cam both will allow the clyinder to fill more. This usually means going to a colder (lower number) plug. You may even get away with using a 23. I hope this clears that up
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Bill Heiser
90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter
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