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4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

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Old 10-04-2012, 01:59 PM   #1  
joshb
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Default What would U do

car 1998 mustang gt cai underdrive pulleys exhaust

im going to have money to spend options?

ported pi head intake and comp cam 270 between 260-300 hp

03-04 pi motor comp cam 270 and nitrous 260-350 hp

im interested in cost ive heard wayyyy to many things bout pi head swaps costing between 500 to 2 grand

in ur opinion what would u do
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Old 10-04-2012, 02:07 PM   #2  
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If your doing nitrous I would do pi head and intake swap on your car.

Because by swapping to PI heads on. Non PI motor you actually raise your CR some
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Old 10-04-2012, 03:22 PM   #3  
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Double post
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Old 10-04-2012, 06:56 PM   #4  
T.Richardson
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I have never understood why people dp the PI swaps, they raise the compression ratio, and there are better options out there.

Take a look at Airflow Research. They put in a set of there heads in a stock '95 GT and had gains of +40 rwhp, and +40 rwt

Also, for cams, I recomend custom grinds. Or check out Cushman Motorsports.
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Old 10-04-2012, 07:28 PM   #5  
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Quote:
Originally Posted by T.Richardson View Post
I have never understood why people dp the PI swaps, they raise the compression ratio, and there are better options out there.

Take a look at Airflow Research. They put in a set of there heads in a stock '95 GT and had gains of +40 rwhp, and +40 rwt

Also, for cams, I recomend custom grinds. Or check out Cushman Motorsports.
Probably because not many companie make heads for a mod motor and company that do are very expensive. A 95 is a 302
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Old 10-04-2012, 07:46 PM   #6  
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Quote:
Originally Posted by T.Richardson View Post
I have never understood why people dp the PI swaps, they raise the compression ratio, and there are better options out there.

Take a look at Airflow Research. They put in a set of there heads in a stock '95 GT and had gains of +40 rwhp, and +40 rwt

Also, for cams, I recomend custom grinds. Or check out Cushman Motorsports.
PI swaps can add 60 rwhp if tuned right.

It bumps the CR up by like ~.5
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Old 10-04-2012, 09:32 PM   #7  
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Quote:
Originally Posted by dwtjr3 View Post
PI swaps can add 60 rwhp if tuned right.

It bumps the CR up by like ~.5
9.2 up to 10.7

i did the math when i did my swap, from what ive heard pi swaps love nitrous too

full bolt on pi swap with decent cams and longtubes back should be right around 300rwhp
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Old 10-04-2012, 11:36 PM   #8  
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i know pi swaps raise compresion but i dont know what a better and cheaper option would be there going to make the same numbers
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Old 10-05-2012, 09:52 AM   #9  
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personally, i wouldnt do the 270 cams unless you notch the pistons.
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Old 10-06-2012, 09:09 AM   #10  
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ive heard its between the 262 for street or the 270 the 270 is more mild sips more gas but its worth it can anyone give me a definite answer on how much it would be do a "head swap" ive heard and read anywhere from 500 to 2000 dollars

how much rwhp do u guys think a PI 4.6 with p&p heads and a 262 or 270 cam with minor bolt ons will make
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