11-18-2003, 05:38 PM
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CC Member
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Join Date: Jun 2001
Location: Washington DC Metro (Virginia),
VA
Cobra Make, Engine: Classic Roadsters, Tweaked 351W, T-5Z, CRII Tech Support Team.
Posts: 1,895
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Not Ranked
This is a time imemorial question with no easy answer, just starting points.
For a stock Ford engine, the factory manual should specify which plug to use. A heatrange up, or down, should be all that is necessary. Up a notch, (hotter plug) for cold weather, city type driving. Down a notch (colder plug) for hyway driving in hot climates.
Non-OEM heads (AFR, Edelbrock, Trick Flow Specalties, itc., will have their own spark plug recommendations.
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spark plug ???????
Linear Mode
