Welcome To V6Mustang.com!

We are the oldest and largest V6 Mustang forum on the internet. If you have any questions about your V6 Mustang or just want to connect with other V6 Mustang owners around the world, you have found the best place on the internet to do that.

Registering is free and easy! Hope to see you on the forums soon!

The Official 4.2 Swap Thread

Discussion in 'Archive' started by TheCheeksMcDuke, Sep 23, 2012.

  1. TheCheeksMcDuke

    TheCheeksMcDuke That guy

    Joined:
    Dec 25, 2011
    Messages:
    101
    Likes Received:
    1
    Trophy Points:
    0
    Location:
    Washington
    DISCLAIMER: In no way am I trying to take credit for writing this.These are the writings of PETE from V6Power. I am merely reposting for everyone's general fund of knowledge due to the many people asking. The original thread can be viewed here: The official 4.2 swap post - V6Power Messageboard


    I can't remember there ever being a truly accurate 4.2 post so here goes...


    Early 97-98 4.2s had a 2-pc main girdle that connected the 1st to the 2nd main cap and the 3rd to the 4th main cap and had larger main bolts. Mid-1998 and up 4.2s used a 1-pc girdle that only connected the rear 3 main caps and had smaller main bolts.

    To use the early 4.2 in any Mustang will require replacing the girdle with a newer 3 main style from a 4.2, get a 99-up 3.8 girdle or just delete it. You will also have to cut the girdle studs sticking out of the head of the main bolts on the 1st main bearing. The 99-00 3.8s used a factory windage tray/girdle that is better than nothing but certainly not ideal. The 01-up 3.8s use the same windage tray/girdle as the 4.2.

    Late 00 3.8s are actually early 01 spec engines that are internally balanced. If you have one of these.....just use the notes for an 01-up.


    94-98 Single port heads

    - 4.2 shortblock
    - Single port heads/fuel rail/intake
    - Mustang 3.8 water pump
    - Auto trans = 4.2 or 01-up flexplate
    - 5spd = 01-up or rebalanced 3.8 (0 or neutral) flywheel and a pilot bearing
    - Re-use your stock cam position sensor
    - 01-up 3.8 oil pan
    - 01-up 3.8 oil pick-up tube and screen
    - 4.2 damper or 01-up 3.8 damper (use the 01 pulley for blower cars)
    - Re-use the stock 3.8 oil pressure sender and tube
    - Re-use the Mustang headers
    - You can use the 4.2 or 3.8 dipstick. Just keep track of where 5 qts puts the mark when refilling with oil.


    94-98 Split port heads

    *** You will need to perform all the mods required for a split port conversion plus these steps for the 4.2 (see pbmilan or V6sprout for the video) ***

    - 4.2 shortblock or longblock
    - You can use the 4.2 heads
    - Mustang upper and lower intake
    - Custom return style fuel rail (VMP has them)
    - Mustang 3.8 water pump
    - Auto trans = 4.2 or 01-up flexplate
    - 5spd = 01-up or rebalanced 3.8 (0 or neutral) flywheel and a pilot bearing
    - Re-use your stock cam position sensor
    - 01-up 3.8 oil pan
    - 01-up 3.8 oil pick-up tube and screen
    - 4.2 damper or 01-up 3.8 damper (use the 01 pulley for blower cars)
    - Re-use the stock 3.8 oil pressure sender and tube
    - Re-use the Mustang headers
    - You can use the 4.2 or 3.8 dipstick. Just keep track of where 5 qts puts the mark when refilling with oil.


    99-00 split port heads

    - 4.2 shortblock or longblock
    - You can use the 4.2 heads
    - Mustang upper and lower intake and fuel rail
    - Mustang 3.8 water pump
    - Auto trans = 4.2 or 01-up flexplate
    - 5spd = 01-up or rebalanced 3.8 (0 or neutral) flywheel and a pilot bearing
    - Re-use your stock cam position sensor
    - 01-up 3.8 oil pan
    - 01-up 3.8 oil pick-up tube and screen
    - 4.2 damper or 01-up 3.8 damper (use the 01 pulley for blower cars)
    - Re-use the stock 3.8 oil pressure sender and tube
    - Re-use the Mustang headers
    - You can use the 4.2 or 3.8 dipstick. Just keep track of where 5 qts puts the mark when refilling with oil.


    01-up split port heads

    - 4.2 shortblock or longblock
    - You can use the 4.2 heads
    - Mustang upper and lower intake and fuel rail
    - Mustang 3.8 water pump
    - Auto trans = your stock flexplate
    - 5spd = your stock flywheel and a pilot bearing
    - Re-use your stock cam position sensor
    - Your 01-up 3.8 oil pan
    - Your 01-up 3.8 oil pick-up tube and screen
    - Your stcok 01-up 3.8 damper
    - Re-use the stock 3.8 oil pressure sender and tube
    - Re-use the Mustang headers
    - You can use the 4.2 or 3.8 dipstick. Just keep track of where 5 qts puts the mark when refilling with oil.
     
  2. Number Tew

    Number Tew Local Jester

    Joined:
    Sep 15, 2012
    Messages:
    288
    Likes Received:
    0
    Trophy Points:
    26
    Location:
    Orlando, Fl
    01+ pan is 6 quarts :)
     
  3. V6procharged

    V6procharged Moderator Staff Member

    Joined:
    Dec 24, 2006
    Messages:
    9,451
    Likes Received:
    8
    Trophy Points:
    48
    Location:
    SC
    is it really? always thought it was about 5.5 qts.

    thanks for bringing this here garrett.
     
  4. JpL4K3

    JpL4K3 Moderator

    Joined:
    Aug 28, 2006
    Messages:
    4,918
    Likes Received:
    14
    Trophy Points:
    48
    Location:
    Central Florida
  5. Number Tew

    Number Tew Local Jester

    Joined:
    Sep 15, 2012
    Messages:
    288
    Likes Received:
    0
    Trophy Points:
    26
    Location:
    Orlando, Fl
    Hmm, Tom told me it was 6, and with 6 quarts its right on the money. Ah well I won't argue :)
     
  6. Silversleeper

    Silversleeper New Member

    Joined:
    Jan 31, 2012
    Messages:
    131
    Likes Received:
    0
    Trophy Points:
    0
    Isnt it a 4.3? not that it matters and your saying on a 99-00 engine if your using a blower use a pully from a 2001?
     
  7. Number Tew

    Number Tew Local Jester

    Joined:
    Sep 15, 2012
    Messages:
    288
    Likes Received:
    0
    Trophy Points:
    26
    Location:
    Orlando, Fl
    no its a 4.2, it turns into a 4.3 when its stroked a little more, or bored out.
     
  8. Silversleeper

    Silversleeper New Member

    Joined:
    Jan 31, 2012
    Messages:
    131
    Likes Received:
    0
    Trophy Points:
    0
    Ahhh okay
     
  9. davidcseifert

    davidcseifert that V6 guy

    Joined:
    Sep 13, 2012
    Messages:
    909
    Likes Received:
    19
    Trophy Points:
    28
    Location:
    White Hall, AR
    number tew what does your car put down? just curious
     
  10. Number Tew

    Number Tew Local Jester

    Joined:
    Sep 15, 2012
    Messages:
    288
    Likes Received:
    0
    Trophy Points:
    26
    Location:
    Orlando, Fl
    I havent dynoed since I had vmp tune it for 93. My guess would be in the 240 range since I added LT's and deleted the cats. On 87 with 2 gutted cats, 2 regular cats and stock manifolds it made 205/226 with 140* AIT's.
     
  11. davidcseifert

    davidcseifert that V6 guy

    Joined:
    Sep 13, 2012
    Messages:
    909
    Likes Received:
    19
    Trophy Points:
    28
    Location:
    White Hall, AR
    not bad, what heads/cam are you using?

    my bet on the changes would be 230's, was that SAE or STD?
     
  12. Number Tew

    Number Tew Local Jester

    Joined:
    Sep 15, 2012
    Messages:
    288
    Likes Received:
    0
    Trophy Points:
    26
    Location:
    Orlando, Fl
    218/226 .500, the heads I believe were rpm heads. Bought them from James who said they flowed on par with SSM stage 3s. And what are you asking about measurements for lol
     
  13. davidcseifert

    davidcseifert that V6 guy

    Joined:
    Sep 13, 2012
    Messages:
    909
    Likes Received:
    19
    Trophy Points:
    28
    Location:
    White Hall, AR
    ah ok, and just curious some list one way and some another..
     
  14. Number Tew

    Number Tew Local Jester

    Joined:
    Sep 15, 2012
    Messages:
    288
    Likes Received:
    0
    Trophy Points:
    26
    Location:
    Orlando, Fl
    idk haha. Ah well, thanks for the interest