I am going to ask a real jack *** question you guys so bare with me K.

How exactly do you know if you have f54/p90, I mean is the engine marked or somthing? I have looked on my blocks, and heads of all my engines and havn't seen this any place yet. I am not stupid, just have been working with amarican engines all the way up until 03 so just don't make me look too stupid. thanks guys.

 

yeah its marked i just forget where to look again i know i saw it on mine...but its marked for sure

 

This is not a problem, because I'm sure you are not the only one that dosen't know The head number is located on the passenger side right between the #1 and #2 sparkplugs. It will be stamped N42,N47,P79,P90 if it is a 1975 and up. (This just for refrence guys) The block idenification is on the same side and is located between the #5 and #6 plugs right where the block and head meet. Hope this helps

 

well I knew about that number, but I didn't know that that was the one.

Thanks guys for clearing that up. So the P90 is a turbo head right?