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4G63 Head build ups, 6 Bolt, 7 Bolt

Posted by BogusSVO, Oct 20, 2011

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  1. BogusSVO

    BogusSVO Proven Member

    Joined Jul 1, 2009
    Pensacola, Florida
    Mitsubishi 4G63 Head Build

    I am starting out with 8 heads.
    5 are 1G 6 bolt and 3 are 2G 7 bolt
    I think one may be a Hyundai head
    Some of the heads have been through a machine shop before.
    Some base information has been gathered.
    The heads have been disassembled, thermal cleaned and glass beaded.
    Most of the heads have the oil galley plugs removed.
    All heads will be fitted with +1mm oversized valves
    7 Heads will have installed BC1100 valve springs
    3 Heads will use BC Ti retainers.
    Some heads will receive new seats and/or new guides
    All heads will receive Vition valve stem seals
    Oil port mod #1 will be done

    Front view
    Exhaust side
    Intake side
    Thermostat side

    Measuring head thickness
    New head thickness is 5.200
    AREA Min thickness is 5.185
    Mitsu factory allows a combined total .007 milled from head and block

    Head #914 (This number was stamped by another machine shop)
    head markings G6/8
    10mm exhaust corner studs
    Oil port mod has been done

    (I-F) Intake-Front 5.191 (E-F) Exhaust-Front 5.187
    (I-R) Intake-Rear 5.188 (E-R)Exhaust-Rear 5.182

    Head #200 (This series of heads will start with 200 and count up)
    Head markings 2.0/8
    8mm exhaust corner studs
    Oil port mod NEEDS done

    I-F 5.198 E-F 5.197
    I-R 5.196 E-R 5.194

    Head #201
    Head markings G6/1
    10mm exhaust corner studs
    Oil port mod done

    I have rebuilt this head once before
    Head will receive 16 bronze guides
    16 new seats

    Head has been ported

    I-F 5.190 E-F 5.190
    I-R 5.190 E-R 5.190

    Close up of guides and seats removed
    087.jpg lose up of guides and seats removed


    Head #202
    Head markings G6/5
    8mm corner exhaust studs
    Oil port mod done
    Needs 8 exhaust guides

    I-F 5.167 E-F 5.166
    I-R 5.166 E-R 5.165

    This head is well past service limit, but can be used with a thick head gasket and adjustable cam gears, or work well on a high compression non-turbo engine.

    Head #203
    Head markings none/smooth
    (I think this is the Hyundai head)
    8mm exhaust corner studs
    Oil port mod done

    I-F 5.188 E-F 5.194
    I-R 5.188 E-R 5.194


    Head #204
    Head markings G6S/7
    Oil port Mod done
    Has broken exhaust manifold stud

    I-F 5.200 E-F 5.199
    I-R 5.200 E-R 5.199

    Head # 205
    Head markings G6K/3
    Oil Port Mod Done

    I-F 5.191 E-F 5.192
    I-R 5.192 E-R 5.190

    Head #206
    Head markings G6K/1
    Oil Port Mod Done

    I-F 5.195 E-F 5.195
    I-R 5.196 E-R 5.193

    Some of the Parts I will use
    tk106, Bhern89 and BENISON868 like this.
  2. Calan

    Calan DSM Wiseman

    Joined Jan 16, 2007
    OKC, Oklahoma
    Has one of them got my name on it?


    4K  0

    1992 Eagle Talon TSi AWD
    15.2 @ 89.300 · 1G DSM
  3. BogusSVO

    BogusSVO Proven Member

    Joined Jul 1, 2009
    Pensacola, Florida
    I dont know.... Do I have one of your heads?:hmm:

    I just recently bought 2 more core heads, (1) 6bolt and (1) 7 bolt, to get cleaned up and to the point of these. So I will have a couple of spares in the shop
  4. dsmtwins2g

    dsmtwins2g Proven Member

    Joined Oct 25, 2010
    penscola, Florida
    saw your intro on race850 the other day,what type services do you do besides heads?

    481  0

    1997 Mitsubishi Eclipse GST
    manual · 2G DSM
  5. clbailey

    clbailey Proven Member

    Joined Sep 22, 2011
    Senoia, Georgia
    So, to get this right. Your taking cores and rebuilding them and sending them out? Whats the going price?
  6. BogusSVO

    BogusSVO Proven Member

    Joined Jul 1, 2009
    Pensacola, Florida
    No most all these heads I am building are for my local customers.

    If you need a head, Check with the supporting vendors Like JAM or SIM
  7. RipperXX

    RipperXX Proven Member

    Joined Feb 23, 2003
    Royston, Georgia
    I love how your posting the details specs. I wish more vendors would do this sort of thing. I take if we sent you a head you'd do some work on it for a modest fee? (dependant on the work obviously)

    Street Build 3K  10  9

    1990 Eagle Talon TSi AWD
    13.476 @ 105.48 · 1G DSM
  8. BogusSVO

    BogusSVO Proven Member

    Joined Jul 1, 2009
    Pensacola, Florida
    RipperXX....... Thanks! I am NOT a vendor here on tuners. I do have a samll machine shop and deal with alot of the local DSM crowd.

    If you need a head done, I would check with one of the supporting vendors here! They support DSM Tuners, so the members need to support them!

    I post the info so members will know what to look for and not have an issue if they go to there local machine shops.
  9. turbotalon1g

    turbotalon1g Proven Member

    Joined Oct 19, 2005
    Blaine, Minnesota
    ^which i must say is fricken awesome and much appreciated.

    Drag Race Build 1K  1

    1991 Eagle Talon TSi AWD
    11.333 @ 119.94 · 1G DSM
  10. acecil1992

    acecil1992 Probationary Member

    Joined Jul 8, 2012
    Greensboro, North Carolina
    number one

    number two

    nukber three
  11. Dhan

    Dhan Supporting Member

    Joined Apr 29, 2010
    Denver, Colorado
    Even though this build thread is "carless", I love it! It's interesting to read about.

    And thank you Mr. BogusSVO for all your incite on the forums. I've used your knowledge more then once now.

    2K  4

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
  12. BogusSVO

    BogusSVO Proven Member

    Joined Jul 1, 2009
    Pensacola, Florida
    Geesh A year and a half has past, since I updated this... I found some build notes and thought nI would add the finish specs.

    Head #200

    Ended up with cast replacement guides, +1mm OS valves, vition blue guides

    Head thickness after surface is 5.195

    Combustion chamber 47cc

    Head #201

    Bronze guides, all new seats, Vition blues seals

    BC100 spring kit

    +2mm os Valves

    Head thickness 5.181

    Combustion Chamber 42cc

    Head #202

    Has bronze guides, Used +1mm os Valves, Vition blue seals

    Head thickness 5.162

    Combustion Chamber 45.5
    Last edited by a moderator: Jul 10, 2014
  13. BogusSVO

    BogusSVO Proven Member

    Joined Jul 1, 2009
    Pensacola, Florida
    Head E80

    7 Bolt
    Head thickness 5.191
    Combustion chamber 46cc

    6T valves
    Cast guides
    .500 head bolt holes
    BC1100 springs w/ stock retainers

    Head E81

    Head thickness 5.189
    Combustion chamber 45cc
    6T valves
    Cast guides
    BC1100 springs w/Stock Retainers

    Head E83

    7 Bolt
    G6K 1 Casting
    Head thickness 5.170
    Combustion Chamber 44.25

    6T Valves
    Cast guides
    BC1100 springs w/ stock retainers

    Head 932

    7 Bolt
    head thickness 5.192
    Combustion chamber 44.5cc

    Std SS Valves
    Bronze guides
    Dual valve springs
  14. killercolt

    killercolt Proven Member

    Joined May 23, 2008
    Acworth, Georgia
    Great info
  15. buhay6

    buhay6 Proven Member

    Joined Jul 9, 2010
    Delisle, SK, Canada
    Thanks for the info BogusSVO, even if its old stuff I know nothing about machine work so between you and jafro on youtube I'm learning a lot about what's all involved and the lingo. So thank you very much, A+++++

    1K  1

    1992 Eagle Talon TSi AWD
    14.300 @ 98.670 · 1G DSM

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