PI or Port & Polish?

quickstang281 · September 29th, 2007, 12:58 PM

im going to wyotech in blairsville, pa. they let me bring my car in to work on and i want to either port and polish the heads or get pi heads. any suggestions?

lefty88josh · September 29th, 2007, 01:59 PM

do a pi swap and then port and polish those then you'll get the best of both but as for money wise just pi swap because you dont wanna fuck up a set of heads... ya know what i mean??

jersey98gt · September 29th, 2007, 03:26 PM

depends on your plans for the car. ie...do you want a power adder later on

quickstang281 · September 29th, 2007, 08:24 PM

honestly as much as i'd love to, i'll probably end up not supercharging it, unless i hit the lottery or something lol...so you guys think i should just go with the PI heads? cause the school im going to i could easily port and polish my stock heads there, if its worth it

jersey98gt · September 30th, 2007, 07:44 AM

if thats the route you want to go, port and polish your PI heads.

ujslost · September 30th, 2007, 10:15 AM

NPI heads respond better to porting and polishing i think.
Ask boomer, he knows.

nes · September 30th, 2007, 10:21 AM

ported pi ftw.

if i remember i read that ported npis do flow better with a cam with a lift of .550 or greater but cause ptv issues with the stock pistons requiring new pistons, and the ported pis will still give you a better downlow grunt...

Boomer · September 30th, 2007, 11:56 AM

Originally Posted by nes

ported pi ftw.

if i remember i read that ported npis do flow better with a cam with a lift of .550 or greater but cause ptv issues with the stock pistons requiring new pistons, and the ported pis will still give you a better downlow grunt...

That is incorrect, lift has nothing to do with PTV, it occurs in the low lift areas. The piston is almost 3" away at the point of max. lift.

G.T. Rags · September 30th, 2007, 11:58 AM

so now that ur here Napolean, care to explain which is better? again

jersey98gt · September 30th, 2007, 12:20 PM

yea before i go out and buy a pair of these. future plans include a junkyard supercharger if i dont get the heads if i do im going bottle fed

ujslost · September 30th, 2007, 01:28 PM

i tell ya what i think boomer should do is write us up a sticky. because this npi vs pi head thing comes up way to often. and boomer knows more than any of us do about these heads. He has his own porting and polishing business. I am currently using him now for my fox body heads, and am gonna use him in the future, when i start to heavily mod the sn95. Many other ppl here have used him and have great results.

G.T. Rags · September 30th, 2007, 01:31 PM

make a sticky!!!!!

join us

ujslost · September 30th, 2007, 01:34 PM

everyone that wants boomer to make us a sticky about the NPI vs PI heads and porting and polishing chime in here and just type.....

Sticky Boomer!

G.T. Rags · September 30th, 2007, 01:35 PM

Stick it in Boomer.......i mean Sticky Boomer

jersey98gt · September 30th, 2007, 04:15 PM

yea sticky boomer

nes · September 30th, 2007, 07:41 PM

Originally Posted by Boomer

Originally Posted by nes

ported pi ftw.

if i remember i read that ported npis do flow better with a cam with a lift of .550 or greater but cause ptv issues with the stock pistons requiring new pistons, and the ported pis will still give you a better downlow grunt...

That is incorrect, lift has nothing to do with PTV, it occurs in the low lift areas. The piston is almost 3" away at the point of max. lift.

welp proven wrong. so what causes the ptv problems?

MustangMatt96GT · September 30th, 2007, 08:36 PM

Originally Posted by nes

welp proven wrong. so what causes the ptv problems?

When the duration is so long that the valves are still open when the piston is high enouhg in the stroke that they hit. It also has to do with the lift while at that duration.

Sticky Boomer ( if he is willing to write it, he sucks at the internet!

)

ujslost · September 30th, 2007, 08:49 PM

if he would ever get his ass online!
Since having his baby girl, hes been really busy.

G.T. Rags · September 30th, 2007, 08:54 PM

Originally Posted by ujslost

if he would ever get his ass online!
Since having his baby girl, hes been really busy.

it'll be a good learning experiance for her though.....u gotta start them young these days

MustangMatt96GT · September 30th, 2007, 09:01 PM

Originally Posted by 96GTRagTop

Originally Posted by ujslost

if he would ever get his ass online!
Since having his baby girl, hes been really busy.

it'll be a good learning experiance for her though.....u gotta start them young these days

What? Wat learning expirence? This is his 3rd or 4th! lol

September 29th, 2007, 12:58 PM	#1
quickstang281 Regular 1998 Mustang GT 14.6 @ 96 Join Date: Aug 2007 Location: New Jersey Posts: 82 iTrader: 0 reviews	PI or Port & Polish? im going to wyotech in blairsville, pa. they let me bring my car in to work on and i want to either port and polish the heads or get pi heads. any suggestions?

September 29th, 2007, 03:26 PM	#3
jersey98gt Enthusiast Join Date: Jan 2007 Posts: 661 iTrader: 0 reviews	depends on your plans for the car. ie...do you want a power adder later on __________________ -BBK CAI, BASSANI CB + X, SCT 93 tune, 4.10s, Cobra brakes, Cobra R wrapped in nitto 555 tire. -College Football and studies take up the bulk of my time.

September 30th, 2007, 07:44 AM	#5
jersey98gt Enthusiast Join Date: Jan 2007 Posts: 661 iTrader: 0 reviews	if thats the route you want to go, port and polish your PI heads. __________________ -BBK CAI, BASSANI CB + X, SCT 93 tune, 4.10s, Cobra brakes, Cobra R wrapped in nitto 555 tire. -College Football and studies take up the bulk of my time.

September 30th, 2007, 10:15 AM	#6
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	NPI heads respond better to porting and polishing i think. Ask boomer, he knows. __________________ 1986 Mustang GT t-top time piece!

September 30th, 2007, 10:21 AM	#7
nes Enthusiast Join Date: May 2007 Posts: 962 iTrader: 0 reviews	ported pi ftw. if i remember i read that ported npis do flow better with a cam with a lift of .550 or greater but cause ptv issues with the stock pistons requiring new pistons, and the ported pis will still give you a better downlow grunt... __________________ silver 98gt, blown- sold laser red 98gt, stock- gave away stormy blue 09 mazda3-traded 09 subaru wrx- soon to be 12 sec. daily driver 1988 gt- toy

September 29th, 2007, 01:59 PM	#2
lefty88josh Regular Join Date: May 2007 Location: norfolk,VA and anywhere the navy puts me:( Posts: 80 iTrader: 0 reviews	do a pi swap and then port and polish those then you'll get the best of both but as for money wise just pi swap because you dont wanna fuck up a set of heads... ya know what i mean??

September 29th, 2007, 08:24 PM	#4
quickstang281 Regular 1998 Mustang GT 14.6 @ 96 Join Date: Aug 2007 Location: New Jersey Posts: 82 iTrader: 0 reviews	honestly as much as i'd love to, i'll probably end up not supercharging it, unless i hit the lottery or something lol...so you guys think i should just go with the PI heads? cause the school im going to i could easily port and polish my stock heads there, if its worth it

September 30th, 2007, 12:20 PM	#10
jersey98gt Enthusiast Join Date: Jan 2007 Posts: 661 iTrader: 0 reviews	yea before i go out and buy a pair of these. future plans include a junkyard supercharger if i dont get the heads if i do im going bottle fed __________________ -BBK CAI, BASSANI CB + X, SCT 93 tune, 4.10s, Cobra brakes, Cobra R wrapped in nitto 555 tire. -College Football and studies take up the bulk of my time.

September 30th, 2007, 01:28 PM	#11
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	i tell ya what i think boomer should do is write us up a sticky. because this npi vs pi head thing comes up way to often. and boomer knows more than any of us do about these heads. He has his own porting and polishing business. I am currently using him now for my fox body heads, and am gonna use him in the future, when i start to heavily mod the sn95. Many other ppl here have used him and have great results. __________________ 1986 Mustang GT t-top time piece!

September 30th, 2007, 01:34 PM	#13
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	everyone that wants boomer to make us a sticky about the NPI vs PI heads and porting and polishing chime in here and just type..... Sticky Boomer! __________________ 1986 Mustang GT t-top time piece!

September 30th, 2007, 04:15 PM	#15
jersey98gt Enthusiast Join Date: Jan 2007 Posts: 661 iTrader: 0 reviews	yea sticky boomer __________________ -BBK CAI, BASSANI CB + X, SCT 93 tune, 4.10s, Cobra brakes, Cobra R wrapped in nitto 555 tire. -College Football and studies take up the bulk of my time.

September 30th, 2007, 08:49 PM	#18
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	if he would ever get his ass online! Since having his baby girl, hes been really busy. __________________ 1986 Mustang GT t-top time piece!

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