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Discussion Starter · #1 ·
Just pulled all the plugs on my 49K '95 4.6...

...and they were AC-Delco R42LTS plugs.

They were the cleanest dang plugs I pulled outta ANY car ever, and all I did was brush the rust off the threads and put 'em back.

1.) Did Ford actually use AC plugs on the line, or did somebody beat me to the original plugs?

2.) Anybody know if these are the stock heat range?


Thanks, in advance, for everyone's help.
 

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Someone beat ya to it. Stock plugs are motorcrafts.

Im merely GUESSING here, but assuming that the 42 indicates heat range, and its on the same scale as motorcrafts, i would say they are one heat range higher. The stock motorcrafts are 32's
 
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