Thread: 351W Spark Plugs
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Old 03-17-2004, 06:43 AM
Bill V Bill V is offline
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That's a tough question, but I did some research. Using a 1970 Mustang, Torino etc as an example, the 351W compression ratio was 11:1 and was equipped with Autolite AF-42 with the gap set to .035". The Motorcraft AF42C is the equivalent with the gap set to .035" or .889 mm (.9 mm). These translate to an NGK UR4 or UR4GP (Platinum).

Anyway, this is where I got my info it may or may not apply to you depending on your particular config but I think there is enough info in these links to get you where you need to go. Best of luck.

http://www.thecarsource.com/fords/en...351engine.html

http://www.motorcraft.com/default.asp?T=3&PageID=0
Last edited by Bill V; 03-17-2004 at 06:56 AM..
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