04 5.4 heads on 96 4.6 block

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09-18-2007, 07:13 AM

#21

Mark99GT

4th Gear Member

Join Date: Feb 2004

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Posts: 1,895

RE: 04 5.4 heads on 96 4.6 block

Quote:

ORIGINAL: 96GTSMOKER

I think it will be faster than my 96 gt stcok motor. 5.4 pistons have got to be bigger and I think he is dong more than I say or understand. I still got a week to wait and I hope it pushes with the dyno tune close to 300 rwhp but I am hoping to get 280 most. With the Demon Tuner already on my stock motor it should work with this motor also.

There is no difference in piston diameter between a 4.6 and a 5.4. The crank stroke/rod lengthmake up the extra displacement. A 4.6 and 5.4 bothhave a 3.552" borestock. If you had your motor rebuilt for 3 grand and he put stock 04 pistons back in it you have a stock Mustang GT and a lighter wallet. It doesn't matter if the pistons came from a 4.6 or a 5.4, they're the same diameter.

Like everyone else said, for 3 grand you could have a built motor. It surprises me that you're forking out this kind of cash and you don't really know what the guy is doing to it. It sounds like hesees this too and is taking advantage of you.

I think you need to get a list of the actual modifications this guy is making and post it here. All we can really do is speculate, and it doesn't sound like you reall know what you're talking about (no offense). So for us to help you out we need more, hard info.

09-18-2007, 04:10 PM

#22

andy98gt

3rd Gear Member

Join Date: Apr 2005

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Posts: 776

RE: 04 5.4 heads on 96 4.6 block

That sucks for that guy.

09-18-2007, 10:00 PM

#23

djb1187

5th Gear Member

Join Date: Dec 2005

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Posts: 2,791

RE: 04 5.4 heads on 96 4.6 block

yesandy...its GREAT for the building. and sucks for the owner of the car

09-18-2007, 10:51 PM

#24

racer02GTstang

5th Gear Member

Join Date: Mar 2005

Location: Nashville/Knoxville, Tennessee

Posts: 4,687

RE: 04 5.4 heads on 96 4.6 block

the 04 pistons will give you 9.4 compression... if you keep your stock ones you will run like 9.7 compression which is more power... the pi heads have less cc of a chamber compared to the npi so they make it up by taking some outta the piston.