ibd2328

iTrader: (2)

Sure you have Romeo heads?

TanTriton

RF-1L2E is what's stamped on my head. Is that a Romeo?

TanTriton

Here is a link;
http://www.timesert.com/html/pi.html

Carcrazygts2

If i recall all 5.4 heads are windsors. As the 5.4 was produced out of the Windsor plant. Also Most I have seen with 8 thread heads have a build date of 1/03. Unless it was a lightning.

TanTriton

The OP has a 5.4, I should have clarified that my '03 is a 4.6. Thanx.

Z7What

The 8 thread heads started in 03, not sure exactly when they started, my 03 had 4 thread. I'm also pretty sure I have read on the L boards that there were even a few 04s with 4 thread heads.

Having a Lightning doesn't mean anything. There are more 4 thread Lightnings on the road than 8 threads!

BTW the 4.6L, 5.4L, & 5.4L Supercharged all had the same heads & cams so saying one model came with 8 threads isn't true, it was hit or miss.

Wayne

triton318

I just bought a 2003 F-150, 4.6L V8, and I've been on this forum doing some reading to get up to speed with preventative maintenance, possible issues, etc. I've already come across several threads regarding spark plug blow-out. Do "8" and "4" WRT to threads refer to the number of threads machined into the head where the plugs go? And there's not an issue with 8 thread heads?

What do you recommend I do to be proactive on this?

Thanks.

JCR 56

Torque plugs to 28ft.lbs, dry no anti-seize.

ohYew812

1. Yes


2. Change them at 50k

Green '01

While replacing the cracked plastic intake on my '01 5.4, I decided to replace my plugs and found four of the old ones to be barely more than finger tight.
It would be a good idea to check them all periodically.