1968 302 correct spark plug V8 - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 03-08-2010 Thread Starter
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1968 302 correct spark plug V8

Hi I'm living here in Ireland, and was hoping to change out the spark plugs, The plugs that i removed are a Motorcraft BSF42C plug.
Question is, Is there a replacement for these plugs, as every shop i've gone to never heard of them and don't know there replacement?. My Car is a 68 Fastback, 302 block. Any help would be greatfull. Thanks
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post #2 of 5 (permalink) Old 03-08-2010
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In ye olden days the plugs would have been Autolite BF42 or Champion UF9Y. In the 70s the Autolite became a 35. In the 80s the Champion was an F9Y. More recently those would be: Motorcraft BF42C, Autolite 45, Bosch D8BC or NGK AP5FS.

Hopefully at least one of those numbers is available in Ireland.
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post #3 of 5 (permalink) Old 03-08-2010 Thread Starter
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Thanks for the quick response. I found out on a different forum since that i could use APR6fs insted of the APR5fs. Does this sound right. Also will the pl;ug gap need to be adjusted.
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post #4 of 5 (permalink) Old 03-08-2010
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Hello digazz,

Asd I was writing Ivy got you covered. Just so you know here is a comparison between Motorcrat and Autolite

Motorcraft Spark Plug, Suppressor.
OEM replacement medium heat range spark plug. Supressor spark plugs include a resistor inside the ceramic coating that reduces engine noise in the radio created by alternators, etc. Plugs feature a tapered seat, 18mm thread diameter, 0.468" reach with a copper core and extended top. Plug gap is 0.035".

Autolite - - #45
Product Type Resistor
Description Copper Core, Extended Electrode
Heat Range Chart Location D21
Hex 13/16"
Reach .460"
Resistor/Non-Resistor/Suppressor Suppressor
Seat Tapered
Thread Diameter 18MM
Tip Power


Good Luck - - P Dad
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post #5 of 5 (permalink) Old 03-08-2010
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From what I understand, the Motorcraft is one of the few non-resistor plugs we can still buy in the US. But then, you may not be able to buy them at all in Ireland? The Autolite 45s are definintely resistor plugs.

Autolite has not been a part of Ford since 1973. Bobby Kennedy was on an anti-trust crusade back then (politicking for president?) and made Ford quit making their own spark plugs, etc. It was OK for GM to own Delco, but not Ford to own Autolite??? Ford had to sell Autolite to Bendix, i.e. Fram. That was when Motorcraft came into being. This tells me that likely the Fords were Republicans.

Quote:
Originally Posted by digazz View Post
Thanks for the quick response. I found out on a different forum since that i could use APR6fs insted of the APR5fs. Does this sound right. Also will the pl;ug gap need to be adjusted.
The 'R' is simply a resistor version which makes less RF noise for newer cars with computers. For older cars without electronics the resistor isn't needed but I don't find they hurt anything.

The '6' will be a slightly colder plug than the '5'. Whether a 5 or a 6 is best for you probably depends upon how you drive, etc., and may be a question only you can answer. The gap should be set to the original spec if you still use the original points/condenser. With a higher energy replacement ignition you can open the gap if you like.
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