## What is needed for a PI swap?

Materials needed for PI Intake Manifold & PI head swap on a 1996-1998 Mustang GT

- PI Intake Manifold.
- PI Heads.
- Heater/Coolant hoses from 1999-2004 GT.
- Alternator Bracket from 2001-2004 Mustang.
- Gasket Set for PI cylinder heads.
- Intake gasket.
- Thermostat gasket.
- Fresh coolant.

**Which Mustangs came with PI heads?**

Today, all Mustang GT V8 engines from 1999-2004 are the PI engine, whereas 1996-1998 4.6’s are referred to as NPI (non performance improved) engines.

**What is the difference between NPI and PI heads?**

The bottom end is identical except the PI motors have a more dished piston that the NPI motor and the PI heads have a smaller combustion chamber and are more efficient so that is where you get the bump in power between the two and also since the NPI motor uses a more flat top style piston and the PI heads have a …

### What is a Ford PI engine?

PI stands for performance improvement or power increased, which is the term for this revised motor installed in every Mustang GT from 1999 through 2004.

**When did Grand Marquis get pi heads?**

Registered. Nope, the Panther platforms(Crown Vic, Grand Marquis, Town car) didn’t receive the Power Improved treatment until the 2001 model year. Find a 2001+ and you get PI heads.

**What is pi and NPI?**

To begin with, a common misconception of the term “PI” is that it DOES NOT mean “Police Interceptor”. It refers to “Power Improved” and the term “NPI” refers to Non Power Improved. Which year Panthers are Non Power Improved and which years are Power Improved? (ROMEO engines) 1992 thru 2000 are NPI.

## What are 4. 6 PI heads?

The 1999-2004 2v heads are the power improved (pi) heads. The non-pi heads rolled out on the 4.6 engine making only 210 horsepower. In 1999, the pi heads were introduced and horsepower rose to 260 horsepower. There is also the SVO 2v head.

**Does a 2004 Grand Marquis have PI heads?**

**What is an NPI motor?**

It refers to “Power Improved” and the term “NPI” refers to Non Power Improved. Which year Panthers are Non Power Improved and which years are Power Improved? (ROMEO engines) 1992 thru 2000 are NPI.

### Will 4v heads fit a 2v block?

It is not worth putting 4v heads on a 2v motor. after you spend all the money to get the necessary parts, and the time and effort you may have just bought a 4v motor.

**What are 4.6 pi heads?**