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Some unsolved 304 conversion queries

Discussion in 'VB - VK Holden Commodore (1978 - 1985)' started by Dan., May 15, 2013.

  1. Dan.

    Dan. New Member

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    G'day fellas.
    I'm in the process of organising all my shit to do a EFI 5L conversion to my VK, originally a carby 202.
    It is going to be initially running the 304 to a th400, through to a temporary locked 3.45 VL 25sp diff. It will be driven like this until I finish the 355 and source a 9" conversion. It's main purpose is as a burnout car with very occasional street duties (occasional as it will be definite sticker bait). I know the VL diff won't last.
    I have a complete VS V8 BT1 and a VL for parts and have sourced the th400 along with a spare.
    I would like to run my perspective on the conversion past those in the know.

    I have sourced a VN loom to fit to the VS V8 to make the wiring a little easier.
    I will be fitting the VS V8 K-frame using VK suspension. I will be using the VS steering rack.
    It will not be running an AC compressor (no need)
    I am yet to source either pacemaker PH5600 or PH5700 extractors.
    It will have the TH400 behind it. I will fabricate a trans crossmember to suit, from what I see it is a relatively simple design.
    Induction will be a simple, gay pod filter for now as the new motor will have a Group A style manifold.
    I am planning to run the VS EFI tank, and run the return line along the existing fuel lines. I understand that I need to wire this up via a relay.
    The VN loom and ECU - I am planning to mount the ECU in the passengers side kick panel as the second gen commodores have with the hole cut in the firewall to suit. I am planning on essentially tucking the old VK loom away out of sight, and joining the looms at the battery - essentially running two looms.
    I am also planning on using the VS radiator however I will likely have to modify or change the lower rad support to suit?

    No doubt there are a few more things I should mention but after a 12hr shift my mind is a bit hazy.

    My questions are.
    1) Does anybody (particularly those who have run a th400 in a VL) know what I should be doing with the tailshaft. I have seen that the V6 conversions with a TH700 use a VN front and VK or VL rear depending on diff. But I am unsure despite how much I search whether the th400 and the th700 are the same length, which I doubt. Also you have had to make a custom tailshaft did you go for single piece or two piece.
    2) Those that have run a TH400 what shifter are you using and has it proved reliable? I have never drove a car with an aftermarket shifter before and wouldn't have a clue what is better than another.
    3) Am I ####ing up somewhere in my game plan?
    4) Will the standard trimatic speedo drive work in the TH400 or should I be sourcing one from a TH400 equipped VB SL/E?
    5) Where's the best place to mount a Chev badge on a VK? I'm having issues working out weight distribution.
    ..... taking the piss.

    You will have to humour me a little fellas. I am away for work until the 6th June and have until the 14th June (eight solid days) to get this first stage of the build completed for a burnout day and thus I can't just go outside and measure things. I am trying to make sure that I have everything that I need ready for me as soon as I'm back so that I can hit it hard.

    Thanks in advance for any help. I have researched the shit out of this in the past few months but the problem is with all the conflicting information out there (especially things based on personal opinion) it gets quite confusing.
     
  2. Dan.

    Dan. New Member

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    Wow first post and I've been a member since '06.
     
  3. brockzila

    brockzila New Member

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    [/QUOTE]5) Where's the best place to mount a Chev badge on a VK? I'm having issues working out weight distribution.
    ..... taking the piss.[/QUOTE]

    Gold :)

    Sorry i have no answers for you
     
  4. Darren_L

    Darren_L Active Member

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    304 conversion I can assist with
    auto trans questions I can't answer unfortunately.

    one question or question mark... I can answer/confirm. If you are going to use a VN-VS radiator, you'll need to cut the lower radiator tie bar off and replace with a VL item
     
  5. Dan.

    Dan. New Member

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    Hi mate, thanks. I thought that may be the case.
    When you have done a 304 conversion in the past did you see any reason as to why running the two looms in that fashion would not work?
     
  6. ari666

    ari666 250,000 hits

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  7. Dan355

    Dan355 Go THE SS's

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    Not keen to go carb?
     
  8. Darren_L

    Darren_L Active Member

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    there's no reason why it won't work
    I used a VR manual loom for all the engine EFI and ignition. I also fit the ECU to the passenger side kick panel and cut a hole in the firewall just above the l/h/s chassis rail to accommodate the EFI loom. I spliced the ignition and B+ power from the VH engine loom connector at the firewall. The rest of the electrics in the engine bay is original VH engine harness, with some minor mods to the alternator connections (to suit the later model alternator)
     
  9. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    Can't really answer your questions, but when it comes time to get your extractors, I can do them at a good price.
     
  10. mr j-man

    mr j-man New Member

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    if its a burnout why not carb, why GrpA manifold?? even if u stay efi....why not go a s/plane manifold like a harrop or pro paw!

    a pro ratchet shifter!

    as for the t/shaft to suit the bw diff and a th400> (do u have the shaft already?) mount the box, fit the rear shaft to suit the diff and measure the front half to suit.
    as for the front it may need to shortened....to give u an idea...i had mine shortened, reco'd and balanced!.....it was cheaper to do this than to source a correct sized front half and have it all fitted and balanced...just a thought to consider.

    when u get the 9" diff sorted, go a 1 piece tailshaft

    as for fuel pump, it will need a relay and a safety cut out triggered from the negative side of coil or the ecu/ign module..

    your chev badge will mount fine to your rear r/h tyre
     
  11. Dan.

    Dan. New Member

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    Will look into that, thanks
     
  12. Dan.

    Dan. New Member

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    Would they have to be collected from Bunbury or up Perth way?
     
  13. Dan.

    Dan. New Member

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    If I ever get bored of the VK or decide to go down a different path I'll still have a motor that will be suitable for a street car (a bit grumpy) and ready to go which is why I would like to stay with injection. I did look into the harrop single plane but I've never been in a 304 with one. The biggest problem is with researching on the internet is that everyone has there own personal opinions on what is best and once again, ends up with conflicting information.
    Shortening the front half would be an ideal idea. No point on spending a great deal of money on a tailshaft that is only a temporary thing. Will go single piece when 9" is sourced...
    Sweet as, thought as much about the fuel pump wiring.

    That'd be the best place for a chev badge on a holden, maybe I could do the world a favour and get rid of one at a time.

    Thanks for your advice bud. I'm going to swing across and have a look at your thread in your sig now, probably give me a world of information
     

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