07+ has a revised head design. They take 1 piece plugs.
See above.Im confused... The spark plug problem on the 3V is the plug, not the heads. Whats wrong with the plug design on the truck? If its the breaking spark plug problem like the 07-08 mustang, then change the plugs, not the heads.
Crack, the 2009 mustangs dont have the plug problems the 07-08 had.
My 2009 3V heads have the other thread count and not the problems of the previous years. I understand my 2007 F150 with 115K miles, I should expect more then one to break. I'm looking for a backup plan if I think I get porcelain or other debris in the cylinder that I'm not confident gets out. If I'm going to pull a head, my 19K miles S197 4.6 3V are available to put back on the 5.4L giving me the updated thread design.i think the heads are the same too but you will not gain anything by switching. ive done many spark plug changes on the 3v 4.6 5.4 engines, ive also broke a few plugs in the heads and i have never had to pull a head to get the broken part out. All the plugs i do, i always upgrade to one piece plug.