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gt40p

  1. S

    5.0 Rebuild

    Hello, First time poster and excited to be here. Picked up my first Mustang - 1990 5.0 with a 5 speed a few months ago. It appears to be a 7up edition but have not verified this. So I've only drove it about 45 minutes home after the initial purchase and then around the block a couple times...
    • smittys7up
    • Thread
    • Nov 29, 2025
    • 5.0 foxbody gt40p rebuild
    • Replies: 8
    • Forum: 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  2. 89 Mustang MS3 gold box tuner studio idle control and injector dead time

    I have a 89 mustang with SBF 302 with GT40P heads and Vortech V1 blower at 10psi and running the ms3 gold box with tuner studio. In the idle control section I'm trying to find out what the valve mode is supposed to be set at inverted or normal for a stock IAC valve. Idle valve type is set at PWM...
    • 91mustanglxcoupe
    • Thread
    • Sep 30, 2019
    • 302 foxbody gt40p idle control injector deadtime ms3 gold box sbf siemens deka 60's tuner studio vortech v1
    • Replies: 15
    • Forum: Digital Self-tuning Forum
  3. T

    GT40P Heads Exhaust

    Quick question because I couldn't find any straightforward answers. I just swapped my heads over to the GT40P's out of a 1997 Explorer. I kept the headers that I had on my Mustang and now, even after flipping my plug wires around, I'm still constantly melting wires 4, 7, and 8 because of the...
    • Tango_Yankee
    • Thread
    • Mar 4, 2019
    • exhaust gt40p headers
    • Replies: 3
    • Forum: 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  4. Gt40p Blues Stuck In Da Stable.

    Greeting Stangnet, This is my first thread ever. I feel like I’m posting wrong because there is lots of GT40P info in here. So here goes. My Stalions a 68 Coup, 90EFI, newly machined GT40P Heads, T-5 tranny with newly installed clutch cable. I didn’t do my resurch well enough as I have newly...
    • Sheep Dowg
    • Thread
    • Feb 11, 2018
    • 1968 mustang clutch cable efi efi swap exhaust gt40 gt mustang 5.0 sbf gt40p headers t-5 t-5 swap
    • Replies: 24
    • Forum: Classic Mustang Specific Tech
  5. Engine Ported Gt40p's??

    Hey boys, a short while ago I had the misfortune of snapping the crank in my gt40p headed 302 (how/why it snapped I have no idea) so I am currently going through the rebuilding process to get her back on the road..I already have a shortblock all done up and ready to go..HOWEVER, when the crank...
    • PakstinN
    • Thread
    • Oct 27, 2017
    • 302 engine fox body mustang gt40p heads windsor
    • Replies: 15
    • Forum: Fox 5.0 Mustang Tech
  6. Engine Timing Issues

    Hello I have an 88 mustang timing is set at 12 btdc was running good now wont start unless distributor is really advanced, pings at 3k rpm and when retarded starts missing at 3k rpm/ sputters Ive replaced: Distributor, Plugs & wires Ignition coil Put a9l ecu in, when I received the car it had...
    • 885.0h
    • Thread
    • Jun 27, 2016
    • 306 gt40p rebuild timing issue
    • Replies: 10
    • Forum: Fox 5.0 Mustang Tech
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