Go Back   Ford Mustang Forums > Mustang > 5.0 Mustang > 5.0L Tech

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.

5.0 Mustangs Tech Forum

5.0L Talk | 5.0L Tech | 94-95 Tech | 1979-1993   1994   1995   Upload Pictures | Timeslips | Power Adders | Mustang Tech 


Reply   Post New Thread
Unread 04-29-2012   #1 (permalink)
J91lx is offline Rookie

5.0L Member


Joined: Apr 2012
Posts: 17 Threads: 6
 J91lx's Country Flag
des plaines   Illinois
J91lx is on a distinguished road
Default gt40 heads Vs. gt40P heads

i was looking to upgrade the heads on my 91 mustang while saving a bit of money, and some of the guys on here recommended gt40 heads off an explorer, however i have found that there are 2 different kinds (the gt40 and the gt40P)

so i was wondering if someone could tell me the differences and which one would maybe be better, thanks!
J91lx is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Unread 04-29-2012   #2 (permalink)
johnGT is offline GT Member


Joined: May 2010
Posts: 1,844 Threads: 103
 johnGT's Country Flag  View johnGT's 1 photo
Dawsonville   Georgia
johnGT is on a distinguished road
Default

gt40p heads have the exact same intake and exhaust cc that stock heads do...BUT, the combustion chamber is angled differently and creates more compression than stock or gt40s. Honestly, I would take either or depending on the price, they are about the same hp gain wise. The gt40p heads have different angled spark plugs that make the sn95 stock headers useless though... Not sure if this is the case with a fox.
__________________
1995 mustang gt vert - 1 of 36 5.0, AODE, 2.73 gears, Pacesetter O/R x-pipe, Flowtech Terminator mufflers. Appx. 410,000~ miles. (honestly not sure..)
johnGT is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 04-29-2012   #3 (permalink)
cmc87 is offline Banned

5.0L Member


Joined: Jan 2010
Posts: 480 Threads: 29
 cmc87's Country Flag  View cmc87's HomePage
Montreal   Quebec
cmc87 is on a distinguished road
Default

Quote:
Originally Posted by johnGT View Post
gt40p heads have the exact same intake and exhaust cc that stock heads do...BUT, the combustion chamber is angled differently and creates more compression than stock or gt40s. Honestly, I would take either or depending on the price, they are about the same hp gain wise. The gt40p heads have different angled spark plugs that make the sn95 stock headers useless though... Not sure if this is the case with a fox.
Yes similar header problems on a fox. I think it can be circumvented with some imaginitive wiring and plug boots.
OP, read this Five.Oh Info : The Ultimate Ford GT40 and GT40P Cylinder Head FAQ
cmc87 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 04-29-2012   #4 (permalink)
YLDPONY is offline SHELBY GT 350 Member

5.0L Member


Joined: Nov 2009
Posts: 8,798 Threads: 46
 YLDPONY's Country Flag  View YLDPONY's 29 photos
Thornville   Michigan
YLDPONY is on a distinguished road
Default

All the information you need (and should research) can be found right here:

Five.Oh Info : The Ultimate Ford GT40 and GT40P Cylinder Head FAQ
__________________
'94 Laser red 'vert. Still a 5-oh... for now
YLDPONY is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 04-29-2012   #5 (permalink)
YLDPONY is offline SHELBY GT 350 Member

5.0L Member


Joined: Nov 2009
Posts: 8,798 Threads: 46
 YLDPONY's Country Flag  View YLDPONY's 29 photos
Thornville   Michigan
YLDPONY is on a distinguished road
Default

Wow, great minds really do think alike
__________________
'94 Laser red 'vert. Still a 5-oh... for now
YLDPONY is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 04-30-2012   #6 (permalink)
drag_lincoln is offline Rookie


Joined: Jul 2011
Posts: 14 Threads: 1
 drag_lincoln's Country Flag  View drag_lincoln's HomePage
lakewood ny   New York
drag_lincoln is on a distinguished road
Send a message via AIM to drag_lincoln Send a message via Yahoo to drag_lincoln Send a message via Skype™ to drag_lincoln
Default

first hand experience with this,among other things. gt40 heads have bigger valves, but the gt40-p makes more power. the gt40 head can be ported,
whereas the p heads only a slight massaging and bowl work will do wonders. If you try to port these you will probably lose velocity and hurt your performance instead.
the gt40 heads will work with any stock exhuast, or regular 5.0 headers.
the p heads on the other hand you will need to use either the frpp offerings, 90 lincoln stock tubular headers"lincoln logs" or bbk 1515 headersin order to fit. you will also need some 90 deg spark plug boots and some heat socks as well.
drag_lincoln is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 04-30-2012   #7 (permalink)
Smurf stang is offline SHELBY GT 500 Member

5.0L Member


Joined: Apr 2009
Posts: 14,068 Threads: 67
 Smurf stang's Country Flag
Miami   Florida
Smurf stang is on a distinguished road
Default

You can look here.....

Five.Oh Info : The Ultimate Ford GT40 and GT40P Cylinder Head FAQ
__________________
2014 V6 Deep Impact Blue Mustang, Borla Type S, 2.73 (Uughh need 3.73)
1989 Sonic Blue Mustang LX Coupe, 349 ci,
392 rwhp 424 rwtq....Mustang Dyno
"There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." -Will Rogers-
Smurf stang is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 04-30-2012   #8 (permalink)
J91lx is offline Rookie

5.0L Member


Joined: Apr 2012
Posts: 17 Threads: 6
 J91lx's Country Flag
des plaines   Illinois
J91lx is on a distinguished road
Default

you guys are life savers! thanks!
J91lx is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply   Post New Thread



Thread Tools



Mustang Photos
Mustang Links    Top Sites    RSS    Link To Us    Add to Favorites    Archive    Terms of Use    Site Rules    Privacy    Contact    Sponsors    Advertise   
AllFordMustangs is not affiliated with or endorsed by Ford Motor Company. ©Copyright 2002-2011 All Auto Enthusiasts Network

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162