What is the difference in heads?

[charlie]

My 99"L" heads And the heads off of a 4.6? Other than I have never heard of a mustang spitting out spark plugs.

And what does PI stand for, relating to the heads?

Thanks
Charlie

[L8 APEX]

All 99-up heads are exactly the same heads and cams. The only diff is in late 03 they went from 4 spark plug threads to 7 threads. All PI heads chuck plugs I even fixed a 96 Cobra head last year.

[wesman]

All 99-up heads are exactly the same heads and cams. The only diff is in late 03 they went from 4 spark plug threads to 7 threads. All PI heads chuck plugs I even fixed a 96 Cobra head last year.

Yep, ask Rocks about his ford Vans chunking plugs :hammer:

[liteitup]

There are Windors and Romeos, they are interchangeable w/the exception of the cam covers. L's have Windsors, mustangs and other vehicles can have either.

PI, power improved

[Beaudee]

Yep, ask Rocks about his ford Vans chunking plugs :hammer:
I bet he was driven too.:D

[Chris94L]

Other than I have never heard of a mustang spitting out spark plugs.

I have several friends that have popped the plugs out of their mustangs. I saw a mustang at a dealership that had caught fire because it popped a plug that was still firing with gas being pumped out of the cylinder by the piston.

[wesman]

There are Windors and Romeos, they are interchangeable w/the exception of the cam covers. L's have Windsors, mustangs and other vehicles can have either.

PI, power improved


Yep, when I spit a plug I got a set of heads from a GT and it turned out I needed to change over the cams from my heads to those due to the timing notch not being on the Mustang head.

--wes