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Spark Plug Advice Needed

imp

Explorer Addict
Joined
November 12, 2009
Messages
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Location
West-Central AZ along the Colorado River
Year, Model & Trim Level
59 Ranchero F250 D'Line
OK, not an Ex, but still, a 5.0L. Recently bought '94 Mustang GT w/5.0L, pulled out a plug today, condition OK, but was the cheapest bottom of the line Autolite, #25, Copper (supposedly, do not understand the relation to "copper". Researched RockAuto for plugs. They list a bunch, for EITHER VIN eng. code "D", or "T".

Researched that, D is said to be 5.0L. Period. T is "HO" (High Output"). My VIN is 4FAP..blah, blah, 42T......so I figger it's a T, HO.

To my knowledge, each and every one of those early '90s Mustangs had 5.0L HOs, if V-8 equipped. Am I wrong there? imp
 






Pretty sure all the 5.0s with roller lifters were considered "H.O."

Copper plugs seem to run best for me in older Fords. Pretty sure I have Auto lite 103s in my 5.0 now.
 






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