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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

PI valves and PI vale springs?

  • Thread starter Thread starter 96SOHC
  • Start date Start date Jun 5, 2004

96SOHC

New Member
Apr 26, 2004
58
0
0
TN
Jun 5, 2004
#1
  • Jun 5, 2004
  • #1
PI valves and PI valve springs?

Just got back from the local Ford dealership and now I'm confused. I am porting and polishing a set of PI heads and wanted to replace the valve springs and a couple of intake valves that had excessive stem wear. The heads are of 2000 year model vintage. In any case, the first thing the salesman asks me is what the VIN number was. I have no clue as these heads were purchased stand alone and not with a car. They are intended to go on my 1996 GT. He states that for the Windsor and Romeo engines, each have separate part number's and prices for both valve springs and intake valves. I thought a PI head was a PI head was a PI head..... The only difference I am aware of are the camshaft caps. He even went so far as to show me on the computer screen as I did not believe him. In any case, the Romeo valve springs sold for $3.49 each; the Windsors $9.83 each. As far as the Intake valves, the Romeos sold for $13.78 each; the Windsors $8.37 each. What gives?
 

nickthegenius

Active Member
Dec 23, 2002
1,631
1
38
Elwood, IN
Jun 5, 2004
#2
  • Jun 5, 2004
  • #2
96SOHC said:
Just got back from the local Ford dealership and now I'm confused. I am porting and polishing a set of PI heads and wanted to replace the valve springs and a couple of intake valves that had excessive stem wear. The heads are of 2000 year model vintage. In any case, the first thing the salesman asks me is what the VIN number was. I have no clue as these heads were purchased stand alone and not with a car. They are intended to go on my 1996 GT. He states that for the Windsor and Romeo engines, each have separate part number's and prices for both valve springs and intake valves. I thought a PI head was a PI head was a PI head..... The only difference I am aware of are the camshaft caps. He even went so far as to show me on the computer screen as I did not believe him. In any case, the Romeo valve springs sold for $3.49 each; the Windsors $9.83 each. As far as the Intake valves, the Romeos sold for $13.78 each; the Windsors $8.37 each. What gives?
Click to expand...

Just to let you know, I have a set of springs out of my '03 GT with 5k miles on them. Check my sig for price. The were replaced with CompCams springs when I did my cam swap.
 
R

Rio96

New Member
Sep 11, 2003
99
0
0
Jun 6, 2004
#3
  • Jun 6, 2004
  • #3
Is there a place where I can find an
overview of 4.6, pi and npi, , valve spings?
installed height, rate, stock dia, etc, etc.

Rio
 

ProCharger GT

Member
Jun 3, 2004
153
0
16
Cleveland
Jun 6, 2004
#4
  • Jun 6, 2004
  • #4
If your looking for an excellent performance spring, you can go with crower, comp cams... or I can sell you the ones im taking off my patriot performance heads their good to .550 lift (which is why i cant use them with stage 3 blower cams .612/.612) so if your interested PM me. Yes they are brand new, never used.
 

96SOHC

New Member
Apr 26, 2004
58
0
0
TN
Jun 6, 2004
#5
  • Jun 6, 2004
  • #5
Rio96 said:
Is there a place where I can find an
overview of 4.6, pi and npi, , valve spings?
installed height, rate, stock dia, etc, etc.

Rio
Click to expand...
As per SHM, the installed height ona 92'-98' cylinder head is 1.390 inches, with a seat pressure of 60 lbs. and an open pressure of 180-200 lbs. On 99' and up PI heads, the installed height is 1.720 with a seat pressure of 70 lbs and an open pressure of 160 lbs @ .500 inches of lift.
 

96SOHC

New Member
Apr 26, 2004
58
0
0
TN
Jun 6, 2004
#6
  • Jun 6, 2004
  • #6
ProCharger GT said:
If your looking for an excellent performance spring, you can go with crower, comp cams... or I can sell you the ones im taking off my patriot performance heads their good to .550 lift (which is why i cant use them with stage 3 blower cams .612/.612) so if your interested PM me. Yes they are brand new, never used.
Click to expand...
Did you go with the Stage I or Stage II heads? I sent you a PM.
 
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