Difference between 275 hp and 310 hp?
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Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
At the very least, the heads are different. The '00-up heads have a "PI" cast into the sides which means Performance Improved.
What all is involved in upgrading a '99 to '00-up 2-valve HP/trq, I'm not completely sure.
At the very least, the heads, probably the intake.
What all is involved in upgrading a '99 to '00-up 2-valve HP/trq, I'm not completely sure.
At the very least, the heads, probably the intake.
Lead Driver
Joined: Sep 2003
Posts: 5,844
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From: Albuquerque
Originally Posted by homecan
What are the differences between the 1999 275 hp engine and the 2000 310 hp engine?
Just kidding, but it was wide open for it.
biz
_______________________________
2003 F250 SD SC 142" XLT FX4 V10 Auto 4x4 3.73s
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Joined: Jul 2002
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From: Long Island USA
Some have thought that the '99 could be brought close to the '00 performance with exhaust, intake stuff and a chip. Whether or not you can get a chip/tuner for the '99 motorhome, that's a different story 
Piece of trivia I picked up in my 2001 service manual today: Did you know that the 5.4's left and right banks have different valve lift? Slightly, but it's there, and spec'd.
Piece of trivia I picked up in my 2001 service manual today: Did you know that the 5.4's left and right banks have different valve lift? Slightly, but it's there, and spec'd.
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Senior User
Joined: Feb 2006
Posts: 245
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From: Carterville, IL
I put a '2000 V-10 in my '99 F-250 a while back....so I got the 310 hp cuz it has PI on the heads, haha yay. I kept the same Computer...had to change a Connector Plug going under the intake to match my Wire Harness...she runs great...no codes. I did notice that that '00 motor didn't have an EGR Valve on the Driver Side Exhaust Manifold so I had to swap Manifolds to have the EGR on my motor. '00 had the EGR Inlet plated off too on the Throttle Body....quick fix. There are only 3 things to be changed on that motor.
The Blue Plug Connector on the Back
Install your EGR Valve on the '00 if u keep the 99 Computer
Run Heater Core Inlet to front of Intake Manifold rather than the Back on the '99
The Blue Plug Connector on the Back
Install your EGR Valve on the '00 if u keep the 99 Computer
Run Heater Core Inlet to front of Intake Manifold rather than the Back on the '99
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Joined: Jul 2002
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From: Long Island USA
devildog, that's great info which I'm sure I'll either forget immediately or remember for the rest of my life - I'm betting on the latter.
Did you notice a power increase and if so, can you quantify it somehow?
thanks!
Did you notice a power increase and if so, can you quantify it somehow?
thanks!
Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
As for the cams,I've seen that stated about the 5.4L cams as well,but I don't buy it. I've actually measured the lift on several sets of cams from 4.6L and 5.4L engines and they are all identical in every way. The minimal differences in lift, duration, and LSA are,IMO,simply manufacturing tolerances.
JL
More Turbo
Joined: Mar 2005
Posts: 522
Likes: 2
If the V10's are like the 4.6 when the PI heads came out, the intake will bolt up but not match as well as a PI intake which could cost you a little power.
On the up side, the NON-PI 4.6 motors had a larger combustion chamber and a small dish piston.
4.6 PI motors have a smaller combustion chamber with larger dish pistons.
Put PI heads on a NON-PI block and your compression goes up to about 10.5:1 and you get more than the 35HP increase due to the additional compression. 4.6 was rated at 225 NON-PI/260 PI (35hp).
Common swap in the mustang world and you have more power than a stock 260 rated 99-04 PI. Those who do this, usually don't don't tune it unless there are other mods (cams, head work, NOS, boost, etc...)
On the up side, the NON-PI 4.6 motors had a larger combustion chamber and a small dish piston.
4.6 PI motors have a smaller combustion chamber with larger dish pistons.
Put PI heads on a NON-PI block and your compression goes up to about 10.5:1 and you get more than the 35HP increase due to the additional compression. 4.6 was rated at 225 NON-PI/260 PI (35hp).
Common swap in the mustang world and you have more power than a stock 260 rated 99-04 PI. Those who do this, usually don't don't tune it unless there are other mods (cams, head work, NOS, boost, etc...)