2003 cylinder head upgrade
#1
2003 cylinder head upgrade
Hi - I have a 2003 Heritage edition with the 5.4L engine. I've been reading on the forums about spark plugs blowing out and most comments say that the heads were upgraded in late 03. When were these upgrades done? I bought my truck in Sept 03 but need to check if it has the newer heads or not.
I bought my truck new and it only has about 51K on it. I've gone back to the original Motorcraft plugs (trying to get better mileage) so the plugs have been changed twice. I used anti-sieze and followed the 13lb torque spec. The Autolite plugs I had in for about a year were all tight when I changed the plugs about a month ago.
Thanks
D
I bought my truck new and it only has about 51K on it. I've gone back to the original Motorcraft plugs (trying to get better mileage) so the plugs have been changed twice. I used anti-sieze and followed the 13lb torque spec. The Autolite plugs I had in for about a year were all tight when I changed the plugs about a month ago.
Thanks
D
#5