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650 turbo head ona a non turbo 650?

Discussion in 'XJ Technical Chat' started by skippy344, Oct 20, 2009.

  1. skippy344

    skippy344 Member

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    Hello Gurus,

    Can I put a turbo 650 head on my non-turbo 650?

    Are they the same head?
     
    skippy344, Oct 20, 2009
    #1
  2. organizedinsanity

    organizedinsanity Member

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    Completely different head. The turbo head has smaller intake/exhaust ports so it would likely hurt performance on the n/a engine.
     
    organizedinsanity, Oct 20, 2009
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  3. skippy344

    skippy344 Member

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    Roger that.
     
    skippy344, Oct 20, 2009
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  4. BlackMax

    BlackMax Member

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    I think the turbo models have lower compression.
     
    BlackMax, Oct 21, 2009
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  5. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    The cam specs are different- - no overlap
    The lower compression might come from the special pistons.
    I would think the basic casting is the same, but I don't know.
    It's drilled for YICS, but that wouldn't matter.
    If the combustion chamber volume is the same, and the valve sizes were the same, and the runners had the same volume (easy to measure)
    you would want to use your old cams, and need to shim all 8.
     
    TIMEtoRIDE, Oct 21, 2009
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  6. organizedinsanity

    organizedinsanity Member

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    The intake and exhaust ports are smaller in diameter. I have verified this by checking my 650 turbo engine versus my 650 maxim engine. The turbo engine does have lower compression but it is due to the pistons not the head. I believe the turbo heads also have smaller valves also but I do not feel like pulling the heads on my engines and finding out.
     
    organizedinsanity, Oct 21, 2009
    #6

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