spark plug question
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Cargo Master
Joined: Mar 2008
Posts: 2,409
Likes: 1
From: Goliad, Texas
spark plug question
yesterday I took my spark plugs out and cleaned them. my grandpa asked me if I know what the "gap" is supposed to be on them; I didn't know what he was talking about, so he showed me how to figure out the "gap" on a spark plug. he said Chevy always used to be .035", but he didn't know what Ford is. so we were pulling the plugs out and I noticed on my engine (300-I6) a tag. the tag says something like, "this engine meets the requirements for the year 1979." it also says at the bottom of the tag the "gap" requirements for the plugs (.042"-.046"). the engine is rebuilt so I was surprised that the tag is still on there. so, I was wondering is the requirements for the "gap" the same on all Fords or it's just the 300 that has those numbers?
Post Fiend
Joined: Apr 2008
Posts: 8,261
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From: Big Sky Country
Spark plug gap has nothing to do with cubic inches, it's generally any where from .035" to .080" depending on the voltage out put of your ignition system.
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Elder User
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Plug gap can change with the year of the truck, my 77 300 says .052-.056, the important thing is to make sure you have the right plugs for your year of engine, gap one to what the sticker says and if it is at an angle to the electrode something is wrong! Most plugs come fairly close to what they should be gapped at so you shouldn't need to bend the tang much at all.
Spark likes to have a flat surface to jump across and if after setting the gap and the tip of the tang is either too close or too far away you will wind up with a poor spark.
FYI, nobody really knows how a spark ignites fuel, they just know it does.
Spark likes to have a flat surface to jump across and if after setting the gap and the tip of the tang is either too close or too far away you will wind up with a poor spark.
FYI, nobody really knows how a spark ignites fuel, they just know it does.