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Set of PI heads, one 4thread and the other is 8thread...

Discussion in '96-04 - 2V Specific' started by Tally_4.6, May 19, 2015.

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  1. May 19, 2015 #1
    Tally_4.6

    Tally_4.6 Well-Known Member

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    The set of PI heads i currently have work getting work done to are mismatched, i discovered last week that one is an 8thread head while the other is a 4thread head.

    Has anyone ever encountered this?

    Point being, obviously i don't have to worry about the 8thread one. But while they're out should i just helicoil all 4 plugholes in that head?
     
  2. May 19, 2015 #2
    kb1982

    kb1982 Active Member

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    I would say yes, definitely be proactive and install them now.
     
  3. May 19, 2015 #3
    96blak54

    96blak54 Legend

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    Dump the 4thread head. Dont repair it. You kill performance potential installing a metal insert wraped around the plug.

    What work are you getting done?
     
  4. May 19, 2015 #4
    Tally_4.6

    Tally_4.6 Well-Known Member

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    Light pNp, 5angle, bowl blending.

    Easier sais than done, but how the hell am I gonna find a lone 8thread PI head?

    You can't tell me anytime anyone has ever had this issue they rip off the head, or heads and go lookin for some 8thread heads.

    Sent from tha trap house.
     
  5. May 19, 2015 #5
    D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    You want lock and stitch aluminum inserts. Where most people go wrong is getting a) helicoils and b) inserts that are steel or stainless steel. While it may be stronger the heat conduction is important from a performance standpoint.

    Yes they could have been mismatched in a car if one replaced under warranty by ford after 03ish. Seen it in trucks I wouldn't doubt it happened in cars.
     
  6. May 19, 2015 #6
    96blak54

    96blak54 Legend

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    05-up crownvics, E250, E350 vans and 2valve F250, F350 all come 8thread.

    Ask me why I wouldnt port or bowl blend. Also let me know what cam your going with
     
  7. May 20, 2015 #7
    J_Sty_

    J_Sty_ Active Member

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    Maybe the one good one on the motor in the black car is 8thread...
     
  8. May 20, 2015 #8
    lwarrior1016

    lwarrior1016 Moderator Staff SN95 Supporter

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  9. May 20, 2015 #9
    Tally_4.6

    Tally_4.6 Well-Known Member

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    225 dollars lol

    Sent from tha trap house.
     
  10. May 20, 2015 #10
    lwarrior1016

    lwarrior1016 Moderator Staff SN95 Supporter

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    I know, but hey.....its a single head!
     
  11. May 20, 2015 #11
    Tally_4.6

    Tally_4.6 Well-Known Member

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    http://www.locknstitch.com/Products.htm

    That?
     
  12. May 20, 2015 #12
    Tally_4.6

    Tally_4.6 Well-Known Member

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  13. May 20, 2015 #13
    D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    Yeah that's the place.... the first website is from 1998 Lol....

    The 2nd is from 2005. Hit the contact us and see if they have machine shops they refer out too. I just happened to find one by asking the ford dealer down the road when my buddy launched his plug
     
  14. May 20, 2015 #14
    96blak54

    96blak54 Legend

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    The locknstitch is Ford TSB approved replacement...only! The locknstich is aluminum allowing excellent transfer of heat from the sparkplug, were as a steel helicoil or timesert creates more hotspots in the chamber and holds the heat in the plug.

    Like ive stated, if youre staying low compression, youll be fine using a steel insert.

    The locknstich requires special tooling and so does the timesert, but the helicoil does not. Locknstitch & timesert tooling with the inserts touch $500. Or find a service rep with the tooling and pay them $100 for the work.
     
  15. May 20, 2015 #15
    Tally_4.6

    Tally_4.6 Well-Known Member

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    Doing my best to stay low compression. Tuned NA at first, then boost later.

    According to my loose calculations, i wanna say around 8.7:1

    '03 GT block and crank
    Boss rods
    -18cc Manley forged pistons
    Lightly ported PI heads
    Comp 270s
    Comp springs & retainers
    37# injectors
     
  16. May 20, 2015 #16
    D3VST8R96GT

    D3VST8R96GT Well-Known Member

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    Man that's apple bottom jeans boots with the fur low.
     
  17. May 20, 2015 #17
    Tally_4.6

    Tally_4.6 Well-Known Member

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    No good?

    Like I said, loose calculations. Fairly sure I got the right specs, using a couple different sites.

    Sent from tha trap house.
     
  18. May 20, 2015 #18
    96blak54

    96blak54 Legend

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    Mmmm...id stick some flattop pistons w/valve reliefs, leave the heads alone, .050" head gasket call it a day.
     
  19. May 21, 2015 #19
    Tally_4.6

    Tally_4.6 Well-Known Member

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    Too late either way.

    But a helicoil should be ok to install?

    Sent from tha trap house.
     
  20. May 21, 2015 #20
    96blak54

    96blak54 Legend

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    You wont like it. They back out. Un like timeserts, their are alot of timesert installers out there. Even I have a kit. Search a few local auto repair shops. One of them bound to have a set.
     
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