Hi, can anyone tell me if a set of 2000 4.6L Mustang GT heads are a "direct" replacement for the 5.4L heads on my Expy? I have the dreaded rt. side oil leak problem and also have a set of factory new GT heads. Thanks for any insight!

b

 

They are both PI heads so they should interchange.

 

Just throwing this out there - food for thought - My question would be are the GT heads Romeo design (I know these were cast at the Windsor plant) and do Romeos bolt to a Windsor block?

-Kerry

 

That would bring me to a question I have. Are the PI 5.4s in trucks all windsors?

 

Yes as far as I know, they are. All that are vin code L should be Windsors.
I have never seen performance heads (aftermarket) that specify Romeo or Windsor. I think the major differences in the engines are timing chain componants and crankshafts where the flywheels bolts up.

 

Thanks for the input--I know the 2000 4.6L that the heads came off of are Romeo engines--would one expect that these heads would fix the dreaded oil leak problem-or put a different way, since the problem seems to be with the heads rather than the 5.4L blocks, is it safe to assume that this is a safe path to follow to not have a repeat leaker? While its apart, anything else I should look at--I'll be putting new plugs, hoses tensioners and chain guides. Should I also replace the head bolts, as I believe they are torque to yield?

 

Yes, the head bolts will need to be replaced. I think the major oil leak problem was from the heads not machined perfectly letting oil seep thru between the head and block.

 

Reading through the Ford Racing Performance Parts website says the heads are Romeo design PIs... Romeos use a rocker girdle, where the Windsors do not. Windsors use another strengthening design.

Somebody has mentioned valve lash adjustments are slightly more difficult with the Romeo's rocker girdles.

-Kerry

 

So then these bad boys will work? http://www.avengercylinderheads.com/...products_id=67

But these are more in my price range.
http://www.avengercylinderheads.com/...products_id=66

 

As I think about it... the heads will work, but you'll want to lose the Mustang cams... they are designed more for the higher end of the rpm scale.

-Kerry

 

I have read that the cams are the same. I read an article where they put a 2000 5.4L in a 99 Mustang Gt and the heads and cams were exactly the same spec's. I'm not positive but that's what the magazine writer said. Intake and exhaust tuning is where the powerband change comes from.

 

Interesting - Makes me wonder why Ford doesn't market the heads as a direct replacement for all PI equipped vehicles? They list them as a GT only item - is there any other thing, besides being Romeo castings, that make them identified as a Mustang only part? If not, then I can't understand the logic.

-Kerry

 

I don't know, the magazine checked the cam lobe measurments and the were the same as the heads off of the GT. Same lift and duration. The 5.4L was out of a 2000 Van. Looking them up online, Windsors and Romeo's show different cam shafts .

CAMSHAFT, Expedition, Navigator, 4.6L, Romeo, Right - 4.6L, 5.4L - 4.6L, 5.4L 97-99 $324.64

CAMSHAFT, Expedition, Navigator, 4.6L, Romeo, Left - 4.6L, 5.4L - 4.6L, 5.4L 97-99 $324.64
CAMSHAFT, Expedition, Navigator, 4.6L, Windsor, Right - 4.6L, 5.4L - 4.6L, 5.4L 97-02 $184.82

CAMSHAFT, Expedition, Navigator, 4.6L, Windsor, Left - 4.6L, 5.4L - 4.6L, 5.4L 97-02 $132.71

Not sure why, but they show the same cams in PI and non-PI heads.
I guess the cams are different. Why is the right side head more than the left????
The Mustang cams show 99-2000. Very strange.
I was looking thru the Ford Racing catalog http://www.fordracingparts.com/downl...gs/2006-pp.pdf And found no cam listings for these engines and just a couple of cylinder heads.

Now I'm all confused

 

That's too funny ... Supply and demand comes to mind.

-Kerry