FR 4.6 PI Heads

mjh78 · Dec 11, 2007

I got into reading about the whole blowing spark plugs and people helicoiling the heads and such. No I haven't blown a plug, just curious and got to looking at what the cost would be to just replace the heads altogether. Jegs has the 4.6 PI Heads and install kit that totals to $486 per side. My question...what is the difference between these heads and the heads that are on a 2000 GT from the factory? I'm assuming the PI heads don't have the $hitty 4 thread plug holes that are prone to having the plugs blown out? what other differences?

Winters98GT · Dec 11, 2007

nothing, they are the same heads.

TGJ · Dec 11, 2007

Winters98GT said:
nothing, they are the same heads.

No,

They are not the same head. 99 - 00 Mustang GT's had Windsor 4.6L 2V motors which had Windsor PI heads. 01+ Mustang GT's had Romeo 4.6L 2V and Romeo PI heads. They are different, try putting valve covers from one onto to the other. The cams are the same profile, however Windsor PI cams have pressed on sprockets while the Romeo's are bolt on.

CobraRed_96_GT · Dec 11, 2007

TGJ said:
No,

They are not the same head. 99 - 00 Mustang GT's had Windsor 4.6L 2V motors which had Windsor PI heads. 01+ Mustang GT's had Romeo 4.6L 2V and Romeo PI heads. They are different, try putting valve covers from one onto to the other. The cams are the same profile, however Windsor PI cams have pressed on sprockets while the Romeo's are bolt on.

believe me, Winters knows this. His question was regarding the number of threads the park plug hole has, not who made the head, what kind of cam towers it has, how many valve cover bolts it uses, or the type of cam sprockets it uses.

TGJ · Dec 11, 2007

mjh78 said:
I got into reading about the whole blowing spark plugs and people helicoiling the heads and such. No I haven't blown a plug, just curious and got to looking at what the cost would be to just replace the heads altogether. Jegs has the 4.6 PI Heads and install kit that totals to $486 per side. My question...what is the difference between these heads and the heads that are on a 2000 GT from the factory? I'm assuming the PI heads don't have the $hitty 4 thread plug holes that are prone to having the plugs blown out? what other differences?

CobraRed_96_GT said:
believe me, Winters knows this. His question was regarding the number of threads the park plug hole has, not who made the head, what kind of cam towers it has, how many valve cover bolts it uses, or the type of cam sprockets it uses.

No it is not, I put in bold his question. Perhaps you and Winters need to read the questions being asked...

That also stated the new Ford PI heads from Ford have more threads for spark plugs. I am not sure what year started getting these improved heads or if the FRPP version is the same.

TGJ · Dec 11, 2007

One thing I missed, the FRPP PI heads that are available are Romeo PI heads( 01+ ).

Gearbanger 101 · Dec 11, 2007

TGJ said:
No it is not, I put in bold his question. Perhaps you and Winters need to read the questions being asked...

Easy tiger....dial it back a bit. Correcting them can be done so without the cynicism

CobraRed_96_GT · Dec 11, 2007

thought he was referring to the difference in thread numbers cuz that's what he was alluding to in the previous sentence - my bad. 96-98 mustang also have romeo blocks as well. Im not sure when ford started selling off more thread numberd heads. It seems all factory mustangs have that problem.

mjh78 · Dec 11, 2007

I guess to clear it up the reason for my question is this: hypothetically say I'm one of those unlucky people and a few plugs blow out of the motor and I opt for new heads vs. trying to do a helicoil or whatever. If I choose to purchase the Jegs heads in question, am I putting on heads that are any different than the heads that came on the car (as far as the plug threads are concerned)? Obviously if the factory heads were constructed with 3 or 4 or however many threads they made the head with for the plugs and this is the reason for the blown spark plugs, why in the world would I turn around and buy a head whose plug threads have not been upgraded to prevent another blown plug? If these heads have the same plug threads as the ones the heads that have caused so many people problems with blown plugs, why on earth would anyone even continue to sell them??

What would be a good head to buy in this situation for someone to buy and that is as least costly as possible?

CobraRed_96_GT · Dec 11, 2007

mjh78 said:
I guess to clear it up the reason for my question is this: hypothetically say I'm one of those unlucky people and a few plugs blow out of the motor and I opt for new heads vs. trying to do a helicoil or whatever. If I choose to purchase the Jegs heads in question, am I putting on heads that are any different than the heads that came on the car (as far as the plug threads are concerned)? Obviously if the factory heads were constructed with 3 or 4 or however many threads they made the head with for the plugs and this is the reason for the blown spark plugs, why in the world would I turn around and buy a head whose plug threads have not been upgraded to prevent another blown plug? If these heads have the same plug threads as the ones the heads that have caused so many people problems with blown plugs, why on earth would anyone even continue to sell them??

What would be a good head to buy in this situation for someone to buy and that is as least costly as possible?

if you have a 2000GT you dont want the heads from jegs anyway, they are a lil different than your since they are romeo. Just have your plug holes heli-coiled properly - that will solve it

TGJ · Dec 11, 2007

Gearbanger 101 said:
Easy tiger....dial it back a bit. Correcting them can be done so without the cynicism

But it is so much more fun...

J/K,

Honestly, I am not trying to be a prick. Just pointed out that the if the person does decide to go with the FRPP heads that he will require more parts.

CobraRed_96_GT said:
if you have a 2000GT you dont want the heads from jegs anyway, they are a lil different than your since they are romeo. Just have your plug holes heli-coiled properly - that will solve it

This would probably be the cheapest method for you to fix the issue.

The FRPP heads may have the improved threads, I have heard that they do. It may not be a bad upgrade. If it was my car and this happened, I would change out both heads if it happened.

FR 4.6 PI Heads

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