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just bought the bronco went to get things for tune up asked for 1982 302 plugs and brought them home. once i pulled the first one, it was diff size, the threaded end of the plug in the truck is biggest i have ever seen. went back and they dont show anything but the 6 cyl 300 that uses these plugs. I have an 8 cylinder in the truck. anyone familiar with the autolite 45, and hwo can I determine what engine I have or if the heads were swapped possibly in the past.
 

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Those were used in the 60's and maybe in to the 70's - I don't know.
My 66 and 67 mustang, both with 289's (same basic engine as the 302) used those autolite 45 plugs.

I'm guessing someone swapped heads on you.
 

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Satyr of the Midwest
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:stupid

Probably engine and/or heads from a 1960s to mid-1970s engine. It's a fairly common plug, or at least it used to be. 18mm threads, 13/16-inch hex. I used RF18YC plugs in my '78 F-250's six-popper, and the same in a 5.0L I built with 1969 cylinder heads.
 

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Driving Stuff Henry Built
-90 xlt, 351w, e4od, man 1356, 3.55, sag, warn hubs, 35s. -73, 400, np435, d20j twin, 35s
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Yeah, probably older heads or engine. Those big plugs were the regular type forever & ever. The current style seemed so little when they 1st came out. They were nicknamed "Peanut Plugs", & we were all bent out of shape about having to buy a 2nd sparkplug socket.
 
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