2002 Harley Davidson f150 5.4 supercharged
 

Spark plug replacements. Are the bosch double platinums # 1803 any good for this truck there pre gapped at .050. I'm running 8 to 10 boost

Nope. These Ford engines do not like Bosch plugs.

Read this thread in the Lightning forum for suggestions:

https://www.f150online.com/forums/li...-lighting.html

Spark plug gap
 

Ngk tr6 what gap at 8-10 lbs of boost or
motorcraft sp 471 plugs at what gap
I do more highway driving than city

Stock boost is .042 gap, close it up .001 for each pound over stock.

Ngk tr6 it is
 

I'm going to tighten it up a little .040
thanks

Torque them to 28 ft/lb to prevent loosening, thread stripping, and blowout.

Ten-four