Go Back   MustangForums.com > Ford Mustang Tech > 4.6L (1996-2004 Modular) Mustang > 4.6L General Discussion
Sign in using an external account
Register Forgot Password?
Search


4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread
Old 03-15-2014, 06:03 PM   #1
knightmare1964
 
Join Date: Mar 2014
Vehicle: 1997 ford mustang gt
Location: ct
Posts: 4
Cool to much?

i just bought a 1997 vortec supercharged mustang gt .they have comp 270 cams in with pi heads that were cut to make 11:1 compression.oh and it has a pms anderson system.some one told me the valves might tap at high rpm.so if so is it possible to degree the cams back one degree to keep this from happing? i forgot its also meth injection.should i just pull the heads and drop the original back on? or can this be tuned to work.
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
knightmare1964 is offline   Reply With Quote
Old 03-17-2014, 08:01 PM   #2
knightmare1964
 
Join Date: Mar 2014
Vehicle: 1997 ford mustang gt
Location: ct
Posts: 4
Default

i'm hoping some one would be able to answer the question about putting the cams back a degree would work or not .thank you
knightmare1964 is offline   Reply With Quote
Old 03-18-2014, 11:13 AM   #3
school boy
4th Gear Member
 
school boy's Avatar
 
Join Date: May 2009
Vehicle: 2001 ford mustang gt
Location: kentucky
Posts: 1,864
Default

Im assuming you meant the heads where milled down to create a smaller combustion chamber? Yes degreeing the cams will allow more clearance. Is the bottom end forged?
__________________

.
Quote:
Originally Posted by the02stang View Post
I just realized that i had a fat friend sitting in the passenger seat that night!
school boy is offline   Reply With Quote
Old 03-19-2014, 08:40 PM   #4
ctgreddy
6th Gear Member
 
Join Date: May 2007
Vehicle: '95 gt 347
Location: Westland, MI
Posts: 6,217
Default

if the pistons are aftermarket they are probably notched for clearance. I'd take the valve covers off and throw a ptv checker spring on one of the cylinders and check how much clearance you have tho just so you know.
__________________


'03 cobra- 2.8 KB mammoth, 19lbs, bolt ons, rxt clutch, sra w/ 3.73's

654/546 whp/tq

Old setup - Ported eaton, 16lbs, minor bolt ons, sra, self tuned.

501/501 - 11.23@124
ctgreddy is offline   Reply With Quote
Old 03-19-2014, 08:43 PM   #5
knightmare1964
 
Join Date: Mar 2014
Vehicle: 1997 ford mustang gt
Location: ct
Posts: 4
Default

yes i do mean milled,but its a stock block.as far as i know.not to sure what to do with this thing.5.0's i know like the back of my hand but all this other stuff is new to me.thank you school boy,that at least points me in the right direction.
knightmare1964 is offline   Reply With Quote
Old 08-12-2014, 09:41 PM   #6
knightmare1964
 
Join Date: Mar 2014
Vehicle: 1997 ford mustang gt
Location: ct
Posts: 4
Default new big problem

hi let me give you the run down,i have a 97 4.6 mustang gt.it has pi heads that have been milled down to make 11:1 compression.and put in 270 comp cams in.cams are degreed so they wont tap pistons.then we have a vortec supercharger with six pounds of boost along with meth injection.and a on board pms anderson system.heres my problem the pms doenst really do anything ,it really doesnt change anything,in third gear up around 5500 it predetonates really bad.screams like a monster till then.tried alotta things like took out timing and fuel and added it and nothing seems to change.
knightmare1964 is offline   Reply With Quote
Old 08-13-2014, 08:05 AM   #7
WhiteFoxGT
Resident Ford Troll
 
WhiteFoxGT's Avatar
 
Join Date: Jul 2006
Vehicle: 98 Cobra
Location: Delaware
Posts: 5,926
Default

have you tried taking it to a tuner who knows what they are doing? that would be where i start. Keep letting it detonate and you'll have a free block venting kit in no time
WhiteFoxGT is offline   Reply With Quote
Old 08-13-2014, 09:54 AM   #8
uberstang1
Chupacabra
 
uberstang1's Avatar
 
Join Date: Jul 2004
Vehicle: 1997 Mustang GT, 2002 F150 XLT 4x4 Triton
Location: wilkes-barre PA
Posts: 9,427
MustangSVT97r
Send a message via AIM to uberstang1 Send a message via Yahoo to uberstang1
Default

Get it to a tuner or like whitefox said your gonna grenade it
__________________
Street Car, 4v D1sc, 20psi,viper spec t56, Team Z/ UPR suspension.
SKELETON CREW RACING
uberstang1 is offline   Reply With Quote
Old 08-18-2014, 05:04 PM   #9
Z28KLR
3rd Gear Member
 
Z28KLR's Avatar
 
Join Date: Nov 2009
Vehicle: 2001 GT
Location: SoCal
Posts: 927
Default

That's a lotta compression for f/i. If a good tuner can't get it figured out, you may need to find a set of unmilled heads (or dished pistons, or both - depending on what you'd ultimately like to do with the car) to get compression back down around 9-ish.

Either that, or ditch the blower and spray it instead. N2O loves high compression.
__________________
__________________________________________

2001 ***** Slayer Red GT convertible; all of the usual bolt-ons.

1967 Notch; 200 I-6, C4 auto
Z28KLR is offline   Reply With Quote
Old 08-21-2014, 09:06 AM   #10
69MustangCoupe393cid
4th Gear Member
 
Join Date: Nov 2006
Location:
Posts: 1,129
Default

Agreed with all the above. That's a lot of compression if you plan on running pump gas and or any kind of boost. I'm running around 10.5:1 and that's pushing it. I get away with it because I'm running the trickflow heads but the regular PI heads don't do as well because of the chamber design.
69MustangCoupe393cid is offline   Reply With Quote
Old 08-21-2014, 09:06 AM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 04:49 AM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup