Port and Polish

MeMz · June 20th, 2009, 05:04 PM

Anyone got a rough idea about how much a port and polish job would be on a set of 97 gt nPI heads? Thinkin bout doing stage 2 cams and Ported & Polished heads + intake. Should yeild good numbers right?....

mustangracer2g · June 20th, 2009, 11:42 PM

the numbers should be nice esp with the pi intake haha

MeMz · June 21st, 2009, 04:01 PM

Im not worried about numbers too much. Mostly trying to get an idea on price so I can budget my whole build. I wana get the best bang for my buck.

NO_PI_NO_POWER · June 22nd, 2009, 06:22 PM

NPI can run pretty quick, but it was so much easier to make power with a set of PI Heads. I had a 9:1 NPI in my car, ported npi heads, comp xe274's, and long tubes, made 219 rwhp. On the PI motor, ported the heads, same 9:1, same cams, same long tubes, added a dragon upper intake and accufab 75mm tb, and it made 299hp. So between the heads, the intake manifold, the upper intake manifold, and the throttle body it picked up 80hp at peak. Went from a 14.6 npi, to 13.5 pi both at bandimere speedway. If budget allows, might look into a set of PI's, we've found them anywhere from free to $300 a set, used.

MeMz · June 22nd, 2009, 08:12 PM

You only picked up 20 hp porting your nPi heads??? Thats just dissappointing..... How much did the port job run you?

NO_PI_NO_POWER · June 22nd, 2009, 08:29 PM

I did both sets of heads myself, just my time and a die grinder, made em bigger and similar. I never did a baseline pull, I think matt made a little over 180 on his, up here, but I couldnt tell you what the gains were from stock, but with the lowered compression and those mods, thats what i made at 5280 feet above sea level. It was corrected, but who knows how accurate any of this dyno business is. The cams and the ported npi heads took me from a 15.2 to a 14.6, and the PI heads, upper intake plenum and throttle body took me from 14.6 to 13.5.

97GT4.6 · June 22nd, 2009, 08:32 PM

But if you are really going to make any power N/A with these engines, you need to have PI heads..

330CubeGt · June 23rd, 2009, 07:55 PM

Originally Posted by NO_PI_NO_POWER

I did both sets of heads myself, just my time and a die grinder,

Port Matching is nice because it frees up some power and it dont cost you anything but your time so its good to do but you will deff see larger gains if you have a pro do them and put them on a flow bench and do it the Right way.Just my 2 Cents.

MeMz · June 23rd, 2009, 08:43 PM

So, ported nPi heads vs pi heads. Which will you see more gains with an aftermarket cam like comp 270's?

330CubeGt · June 23rd, 2009, 11:59 PM

Originally Posted by memory97gt

So, ported nPi heads vs pi heads. Which will you see more gains with an aftermarket cam like comp 270's?

Ported PI's I mean come one Look at the Size of the intake Ports from a NPI to PI,More Flow More Power...

MeMz · June 24th, 2009, 08:13 PM

Yea i figured as much. Still dont know how much a port job will cost. haha. But Im probably gonna get the Pi heads and port them to run comp 270's

NO_PI_NO_POWER · June 24th, 2009, 08:17 PM

Yeah, heads done be a pro may take some variance out, especially with a flowbench, and yes Ported PI Heads will see a larger gain, for sure.

96blackgt54 · June 25th, 2009, 03:52 PM

Originally Posted by NO_PI_NO_POWER

NPI can run pretty quick, but it was so much easier to make power with a set of PI Heads. I had a 9:1 NPI in my car, ported npi heads, comp xe274's, and long tubes, made 219 rwhp. On the PI motor, ported the heads, same 9:1, same cams, same long tubes, added a dragon upper intake and accufab 75mm tb, and it made 299hp. So between the heads, the intake manifold, the upper intake manifold, and the throttle body it picked up 80hp at peak. Went from a 14.6 npi, to 13.5 pi both at bandimere speedway. If budget allows, might look into a set of PI's, we've found them anywhere from free to $300 a set, used.

You are saying that a complete NPI setup compared to the PI set up, the PI is better.

You failed to mention what intake you were using on the NPI setup.

I can promise you that the MARKET put the hype on the PI heads. NPI head are very good contenders when set up correctly.

It is proven that the NPI intake and NPI cams are the choke holds for the NPI heads. WITH STOCK NPI long block, only replacing PI intake and PI cams, their was only a 10hp diffrence between a stock PI longblock and Stock NPI long block wPI intake and PIcams. The PI was 10hp more.

Here's the kicker
The NPI heads have a major restiction around the valve called a swirl dam. This dam promotes in coming air to swirl and mix the gas better and keep it off the cylinder walls. Laying this dam back a little(not removing it) with a dremel(porting tool) improves low lift dramaticly!!!!!!

I've done enough CrownVic and thunderbird reviews to claim the NPI, PI head war is BULLSH!T.

Your NPI heads are awsome heads! Don't sell them short.
Find a set, do some research, and port them yourself. It's easy! Results are great!

NO_PI_NO_POWER · June 26th, 2009, 05:08 AM

PI Has a swirl dam also, and I never said a npi car couldn't be quick, we've taken one to the 11's up here. So, what did you do to get your npi to over 300whp on the motor?

NO_PI_NO_POWER · June 26th, 2009, 06:46 AM

Ran 14.9 with Ported NPI heads, NPI Intake Manifold and stock PI cams. Added comp xe274 cams, made 219whp with the npi intake manifold. Added PI Intake Manifold, ran 14.6

fsttang96 · June 26th, 2009, 01:37 PM

Originally Posted by 96blackgt54

You are saying that a complete NPI setup compared to the PI set up, the PI is better.

You failed to mention what intake you were using on the NPI setup.

I can promise you that the MARKET put the hype on the PI heads. NPI head are very good contenders when set up correctly.

It is proven that the NPI intake and NPI cams are the choke holds for the NPI heads. WITH STOCK NPI long block, only replacing PI intake and PI cams, their was only a 10hp diffrence between a stock PI longblock and Stock NPI long block wPI intake and PIcams. The PI was 10hp more.

Here's the kicker
The NPI heads have a major restiction around the valve called a swirl dam. This dam promotes in coming air to swirl and mix the gas better and keep it off the cylinder walls. Laying this dam back a little(not removing it) with a dremel(porting tool) improves low lift dramaticly!!!!!!

I've done enough CrownVic and thunderbird reviews to claim the NPI, PI head war is BULLSH!T.

Your NPI heads are awsome heads! Don't sell them short.
Find a set, do some research, and port them yourself. It's easy! Results are great!

I was told if your run forced injection you can remove that swirl dam completely ! Would you recommened doing that ?

June 20th, 2009, 05:04 PM	#1
MeMz Super Spud 2002 Camaro SS Join Date: Sep 2008 Location: Jacksonville,NC Posts: 2,342 iTrader: 0 reviews	Port and Polish Anyone got a rough idea about how much a port and polish job would be on a set of 97 gt nPI heads? Thinkin bout doing stage 2 cams and Ported & Polished heads + intake. Should yeild good numbers right?....

June 20th, 2009, 11:42 PM	#2
mustangracer2g Regular 1997 Mustang GT not as slow... PI swapped :-) Join Date: May 2008 Location: San Diego, Ca Posts: 275 iTrader: 0 reviews	the numbers should be nice esp with the pi intake haha __________________ If there's one thing in life you should never take for granted its the ability to drive fast when given the hp to. (PI engine swapped now, so i can go just a lil bit faster haha) oh yeah, and why the hell do imports always try to race me?!

June 22nd, 2009, 06:22 PM	#4
NO_PI_NO_POWER Granny Shifter 1997 Mustang GT 12.297@113.47 Join Date: Jul 2008 Location: Greeley, CO Posts: 752 iTrader: 0 reviews	NPI can run pretty quick, but it was so much easier to make power with a set of PI Heads. I had a 9:1 NPI in my car, ported npi heads, comp xe274's, and long tubes, made 219 rwhp. On the PI motor, ported the heads, same 9:1, same cams, same long tubes, added a dragon upper intake and accufab 75mm tb, and it made 299hp. So between the heads, the intake manifold, the upper intake manifold, and the throttle body it picked up 80hp at peak. Went from a 14.6 npi, to 13.5 pi both at bandimere speedway. If budget allows, might look into a set of PI's, we've found them anywhere from free to $300 a set, used. __________________ 1997 GT 2.6L Kenne Bell Build Thread 1989 LX

June 22nd, 2009, 08:29 PM	#6
NO_PI_NO_POWER Granny Shifter 1997 Mustang GT 12.297@113.47 Join Date: Jul 2008 Location: Greeley, CO Posts: 752 iTrader: 0 reviews	I did both sets of heads myself, just my time and a die grinder, made em bigger and similar. I never did a baseline pull, I think matt made a little over 180 on his, up here, but I couldnt tell you what the gains were from stock, but with the lowered compression and those mods, thats what i made at 5280 feet above sea level. It was corrected, but who knows how accurate any of this dyno business is. The cams and the ported npi heads took me from a 15.2 to a 14.6, and the PI heads, upper intake plenum and throttle body took me from 14.6 to 13.5. __________________ 1997 GT 2.6L Kenne Bell Build Thread 1989 LX

June 22nd, 2009, 08:32 PM	#7
97GT4.6 Hardcore Enthusiast 97 GT 14.2@99.8 @ 4800 ft Join Date: Oct 2007 Location: Fort Collins and Pueblo, Colorado Posts: 2,347 iTrader: 1 reviews	But if you are really going to make any power N/A with these engines, you need to have PI heads.. __________________ Cammed 2v Built By MustangMatt More mods than times your daughter has slept around

June 21st, 2009, 04:01 PM	#3
MeMz Super Spud 2002 Camaro SS Join Date: Sep 2008 Location: Jacksonville,NC Posts: 2,342 iTrader: 0 reviews	Im not worried about numbers too much. Mostly trying to get an idea on price so I can budget my whole build. I wana get the best bang for my buck.

June 22nd, 2009, 08:12 PM	#5
MeMz Super Spud 2002 Camaro SS Join Date: Sep 2008 Location: Jacksonville,NC Posts: 2,342 iTrader: 0 reviews	You only picked up 20 hp porting your nPi heads??? Thats just dissappointing..... How much did the port job run you?

June 23rd, 2009, 08:43 PM	#9
MeMz Super Spud 2002 Camaro SS Join Date: Sep 2008 Location: Jacksonville,NC Posts: 2,342 iTrader: 0 reviews	So, ported nPi heads vs pi heads. Which will you see more gains with an aftermarket cam like comp 270's?

June 24th, 2009, 08:13 PM	#11
MeMz Super Spud 2002 Camaro SS Join Date: Sep 2008 Location: Jacksonville,NC Posts: 2,342 iTrader: 0 reviews	Yea i figured as much. Still dont know how much a port job will cost. haha. But Im probably gonna get the Pi heads and port them to run comp 270's

June 24th, 2009, 08:17 PM	#12
NO_PI_NO_POWER Granny Shifter 1997 Mustang GT 12.297@113.47 Join Date: Jul 2008 Location: Greeley, CO Posts: 752 iTrader: 0 reviews	Yeah, heads done be a pro may take some variance out, especially with a flowbench, and yes Ported PI Heads will see a larger gain, for sure. __________________ 1997 GT 2.6L Kenne Bell Build Thread 1989 LX

June 26th, 2009, 05:08 AM	#14
NO_PI_NO_POWER Granny Shifter 1997 Mustang GT 12.297@113.47 Join Date: Jul 2008 Location: Greeley, CO Posts: 752 iTrader: 0 reviews	PI Has a swirl dam also, and I never said a npi car couldn't be quick, we've taken one to the 11's up here. So, what did you do to get your npi to over 300whp on the motor? __________________ 1997 GT 2.6L Kenne Bell Build Thread 1989 LX

June 26th, 2009, 06:46 AM	#15
NO_PI_NO_POWER Granny Shifter 1997 Mustang GT 12.297@113.47 Join Date: Jul 2008 Location: Greeley, CO Posts: 752 iTrader: 0 reviews	Ran 14.9 with Ported NPI heads, NPI Intake Manifold and stock PI cams. Added comp xe274 cams, made 219whp with the npi intake manifold. Added PI Intake Manifold, ran 14.6 __________________ 1997 GT 2.6L Kenne Bell Build Thread 1989 LX

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