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Cylinder Head compatibility on a 82 Maxim 650

Discussion in 'Hangout Lounge' started by LayItDown, Jun 10, 2012.

  1. LayItDown

    LayItDown Member

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    my exhaust manifold bolts holes are ruined and i need a head. looked around and cant really find the answer to this. exactly what heads will work. its a ycis motor. will the 750 or 550 heads work? what about seca 650 turbo heads. also would any give better performance that others?
     
    LayItDown, Jun 10, 2012
    #1
  2. pbjman

    pbjman Member

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    I think you'll have to go with heads for a 650 yics. If you go non yics, you will have to change two of the carb to engine boots, I think. (and 750's have bigger bore/stroke, 550's are smaller.)
     
    pbjman, Jun 10, 2012
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  3. LayItDown

    LayItDown Member

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    any knowledge on the 650 seca turbo head? there seem to be a lot more of those on ebay than anything else
     
    LayItDown, Jun 10, 2012
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  4. MiGhost

    MiGhost Well-Known Member

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    For the 82-83 650 YICS engine you can use either the 650 YICS, or the 750 YICS head. The only difference is the intake cam on the 750 head has a slightly higher lift. Otherwise it is a direct bolt on swap.

    Ghost
     
    MiGhost, Jun 10, 2012
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  5. pbjman

    pbjman Member

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    Ghost is right, the 650/750 yics heads have same part number. The 650 turbo has a different part number, but I don't know what issues you would have.
     
    pbjman, Jun 10, 2012
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  6. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    650 Turbo heads are low-compression heads.......a step in the wrong direction for normally-aspirated engines.
     
    chacal, Jun 10, 2012
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