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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 04-17-2011, 10:56 AM
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302 Plug Gap increase/ Why?

My 87' 302 call's for a stock plug gap of .044 w/ stock ignition system components. However for 302's only a few years newer, stock plug gap increases to .054 w/ stock ignition system components.

The engines use identical ignition components, down to the last part #"s & Identical spark plugs. Why the .010 difference in plug gap?

If you can answer that, you may have "all" my rep votes. I've been trying to find out how/why for years!

Well, how about 1/2 my rep votes?..........You will definitely a rep vote out of it!!!
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Old 04-18-2011, 12:20 AM
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I would go with it being for emissions sake??? Chrysler did the same thing for the PT Cruiser engine ..... but as a TSB for all model years .... so I have now idea what I should gap at for that car!
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Old 04-18-2011, 12:35 AM
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It was 92 that the gap increased IIRC and I think ford did it to increase some HP.
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Old 04-18-2011, 08:47 AM
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A wider gap is generally used to fire a leaner mixture.
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Old 04-18-2011, 08:47 AM
 
 
 
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1980, 302, 77, engine, f100, f150, ford, gap, plug, plugs, stock

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