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Old 08-10-2014, 03:44 PM   #1
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99 Mustang engine work

So i bought a 99 mustang gt 5 speed last year and am wondering whats been done to the engine. Ill list the specs and see what you guys think. Its more of identifying the engine and figuring out what it is (pi vs non pi/romeo vs windsor)
It has a 6 bolt crank
It has 13 valve cover bolts
Oil fill is on passenger side
Edges of intake ports are smooth not scalloped
Pretty sure it has a pi intake since it goes way down in the valley of the engine

It almost seems like the engine is sitting farther back than it should cuz i added an o/r x pipe and it hit the k frame right near the engine bay plus getting to the studs to bolt it up was near impossible.

I would just like to know what kind of engine it has so if i get more mods like cams in the future i know what im up against. Thanks in advance.

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Old 08-10-2014, 03:50 PM   #2
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All 99 - 2004 models of the gt where pi


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Old 08-10-2014, 04:06 PM   #3
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Yes but im pretty sure this motor isnt stock. What im asking is what its from and if its pi or non pi and windsor or romeo. 99's are supposed to have 8 bolt cranks but this engine has a 6 bolt crank. So something has been changed

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Old 08-10-2014, 04:41 PM   #4
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Strap it on a dyno and see how much power it makes. The passenger side exhaust manifold flange has always been a pain in the butt. More than likely you have a late 01 - 04 motor or a NPI shortblock with PI heads
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Old 08-10-2014, 04:43 PM   #5
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Closest dyno is probably 3 hours away. But dont the pi heads have the scallopped edges on them, not smooth? How can i make sure there pi heads?

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Old 08-10-2014, 04:50 PM   #6
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I have no clue about that, but Google found this. http://forums.corral.net/forums/gt-s...-pi-heads.html
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Old 08-11-2014, 12:40 PM   #7
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To verify they are PI heads you are going to have to yank the intake. If your intake holes are round you have NPI, if they are squarish you have PI heads. 13 bolts=Windsor but there were both NPI and PI Windsors.

Since the car is a 99 and you have a 6 bolt crank... my guess is that you have the original 99 PI heads/cams/intake and a NPI bottom end. Which would be a good thing as a PI swapped NPI is actually going to make a little more power than a regular PI motor, but you have to be aware of a few things if that is the case like a higher compression and a limited cam selection.

Only way to be totally sure what bottom end it is is to pull the heads unfortunately unless you can verify it from the previous owner along with what heads you have.
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Old 08-11-2014, 03:13 PM   #8
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Check the casting numbers you will need a mirror if the heads are still on the car. you can Google the casting number or i think some one on this forum gave me the numbers. if you look on the right side (passenger Side the casting numbers are under the number one exhaust port.

I have the casting numbers in the garage if i get down there tonight i will send them It's High School Football season in Western PA getting to the garage has been difficult
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Old 08-11-2014, 03:17 PM   #9
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It's a NON-PI head if the casting number begins with RF-F5AE. All PI heads begin with either:

RFXL3 or RF1L2E
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Old 08-11-2014, 04:45 PM   #10
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Crap looks like it has non pi heads. I remember lookingat the casting # and it started with rf f5ae. That sucks

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Old 08-11-2014, 06:58 PM   #11
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i'm far from an expert but i'm pretty sure you could have any combination Romeo Block w/Windsor Heads Windsor Block w/Romeo Heads, most of the six bolt flywheels indicate its a Romeo but with that being said i have heard the key word "heard" there are Windsor with six bolts IDK.

I got a set of PI heads off an 03 Explorer
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