Replacement Spark Plugs - 352V8
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Tuned
Joined: Apr 2019
Posts: 294
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From: Southern Ontario
Replacement Spark Plugs - 352V8
I have a 67 F100 352V8 that I want to replace the spark plugs in. The 67 Ford Shop manual lists them as BF-42, what is in the truck now are Motorcraft BSF42C, and my local Ford dealer says he thinks the replacement would be a Motorcraft SP420. Would this be a suitable replacement or does anyone have suggestions for an alternate.
Thanks
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Tuned
Joined: Apr 2019
Posts: 294
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From: Southern Ontario
What the specific technical differences are I have no idea. Near as I can tell the BF-42, BSF-42C, are discontinued Motorcraft plugs and are replaced by the SP420. As Alex mentioned in post number 3 the Autolite 45 and the Motorcraft SP420 are both in the same heat range and what I discovered they are both considered as suitable to use as replacements for the BSF-42C. I ended up with the Motorcraft SP420 which I got at a Ford dealership.
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
Those spark plug cross-reference web sites are goofy. Basically near as I can tell if it will fit it is considered equivalent, that's about it. There ain't no way 45 is the same heat range as all those other plugs they list and vice versa. If you need let's say a step colder than 45, then what? They don't make one. That's why I came to like NGK plugs, they make pretty good spark plug, with a wide heat range selection up and down. With NGK the higher the number the colder. 5 being kind of standard or stock.
I found they used a bit hotter plug back then, than might be necessary today if using an upgraded ignition vs. points. Hotter coil and increased spark energy. Same if doing more highway driving. Leaner fuel mixtures, extra timing as well. Plugs had a tendency towards fouling easier with leaded gas back then too, I expect. It's better to start out with a colder plug and work up. Look for a color change about halfway up the ground electrode. That is just about right, just hot enough to burn off deposits and no more.
I found they used a bit hotter plug back then, than might be necessary today if using an upgraded ignition vs. points. Hotter coil and increased spark energy. Same if doing more highway driving. Leaner fuel mixtures, extra timing as well. Plugs had a tendency towards fouling easier with leaded gas back then too, I expect. It's better to start out with a colder plug and work up. Look for a color change about halfway up the ground electrode. That is just about right, just hot enough to burn off deposits and no more.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Auto-Lite (Motorcraft after 1971) BF-42 or BRF-42 were standard equipment for 1965 and later V8 trucks when new. The R in BRF meant they were radio resistant.
The higher the number, the hotter the spark plug. For example, Y blocks came with BF/BRF-82. If oil burners, BF/BRF-92 were installed in all V8's.
In the late 1980's, the IDIOTS at FoMoCo changed the spark plug part numbers, screwing everything up.
I don't recall any BSF plugs. I know that the dealers I worked the back (shop) parts counters at...didn't use them.
The higher the number, the hotter the spark plug. For example, Y blocks came with BF/BRF-82. If oil burners, BF/BRF-92 were installed in all V8's.
In the late 1980's, the IDIOTS at FoMoCo changed the spark plug part numbers, screwing everything up.
I don't recall any BSF plugs. I know that the dealers I worked the back (shop) parts counters at...didn't use them.
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m-cman
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Jun 28, 2006 02:47 PM
