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Thread: Head swap onto stock g63b

  1. #1

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    05-24-2017
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    Orlando FL, Kannapolis NC
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    1990 Mitsubishi Mighty Max
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    G63B

    Head swap onto stock g63b

    Will a stock non turbo 4g63 head fit a stock g63b block with stock pistons?

  2. #2

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    Adelaide, South Australia
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    1985 Mitsubishi L200
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    G63B
    As long as both assemblies are 6 bolt blocks there won't be a problem. There are differences between 6 and 7 bolt engines like oil gallery reliefs, dowels and head bolts.

  3. #3

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    Orlando FL, Kannapolis NC
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    1990 Mitsubishi Mighty Max
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    G63B
    Quote Originally Posted by geezer101 View Post
    As long as both assemblies are 6 bolt blocks there won't be a problem. There are differences between 6 and 7 bolt engines like oil gallery reliefs, dowels and head bolts.
    So the valves will clear the g63b SOHC pistons?

  4. #4

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    1985 Mitsubishi L200
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    That is a good question. Looking at images of the stock 4G63 cast pistons, they have reliefs for the valves so I am going to say...no. BUT the stock 4G63 pistons run a higher compression ratio of 9:1 compared to the 8.5:1 of the G63B SOHC engines (this may be the loophole that will allow the necessary valve clearance to swap the heads). So I can't be sure I looked at the DSM tuners site and this subject was touched on albeit on the 2.4 and no mention was made of swapping pistons - http://www.dsmtuners.com/threads/can...-block.100056/

  5. #5

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    Ronkonkoma
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    1991 Mitsubishi Mighty Max
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    4G64
    Has anyone here actually done this swap!? I'm kind of feeling like the answer is no and they just use DSM motors.

  6. #6


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    1989 Mitsubishi Mighty Max
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    A majority of the swapped trucks opt for the turbo, or more then 4 cyl. Only one I remember here was I think a 4g dohc non turbo but I believe he used a dohc piston set as well. Theory was talked about on projectzerog but looking though the project cars, all 4g63t.
    1989 Mitsubishi mightymax; 1990 4g63 6 bolt swap: malhe 9.0 pistons, eagle h beam rods, acl race bearings, rebuilt head, evo 3 16g, aem afpr, Maft, 3" gm maf blow through, walbro 255 fuel pump, hks ssq bov, fmic, coil over plug, FIC 750 injectors, dsmlink, apexi avcr, AEM eugo, s90 throttlebody, JMF FIAC block off plate. LT1 T56 in the works, RIP km132.
    Why a mightymax? Why not? 18 psi FTW.

  7. #7

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    Wasco ca
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    1992 Mitsubishi Mighty Max
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    4G64
    I found a head on a 89 galant that look identical to my 92 mighty max head except for it has roller lifters had anybody tryed the swap

  8. #8

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    1985 Dodge Ram 50
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    G63B
    I got my G63B head from these guys. https://www.ramscyl.com/Web%20pages/Mitsubishi.html He was knowledgeable he could probably answer your questions.

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