Plugs for high compression 5.4
I need the part number for the best plugs for my 5.4. I'm using the motorcraft copper plugs for the lightning now gapped at the usual.
I have 11.1:1 compression and get a nasty bit of rattling at low RPM's and some pinging at WOT with 93 octane.
5.4 block from 99 expedition bored .20 over
Forged crank/Manley Rods/JE flat tops/chromemoly rings and Steeda Underdrives
P&P PI heads (by me) w/ 3 angle valve job w/copper gaskets with ARP studs/bolts and One piece lightning cams
80mm Pro-M MAF and Cut & welded '95 4.6 intake
Jmodded Trans & Trac-loc pumpkin (Cobra) 3.27
Raxles, ADDCO 1 1/4", Eibachs, JL Braces
18" CEC type 169 wheels w/ 245/40 front 255/45 rear