302 XXX block

Discussion in 'Fox 5.0 Mustang Tech' started by stevesLX, Sep 17, 2007.

  1. blueblazes

    blueblazes New Member

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    got a friend with 93 cobra 347 built mexican block with s trim and its stood up to the abuse well.

    Ive heard alot of good things about the mexican blocks, from what I understand alot were used in taxis for reliability reasons
     
    #21
  2. The O.G.

    The O.G. Member

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    :OT:



    :shrug: what were your letters xxx/yyy ?

    didnt they make blocks in diff factories, canada/u.s.a.?
     
    #22
  3. info_sorb_88

    info_sorb_88 New Member

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    xxx vs. yyy

    the xxx blocks where cast in the USA where as the yyy blocks where cast in Mexico and have a higher nickle content which make them stronger and are popular for forced induction and heavy nitrous applications.
     
    #23
  4. JadeGT

    JadeGT New Member

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    There is no difference in between the XXX and YYY blocks but you are more than welcome to believe what you want.
     
    #24
  5. Chrome_Rust

    Chrome_Rust Member

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    Someone told me that the XXX or YYY castings in the blocks were a place that was prone to cracking or were thin casting in that area. the XXX or YYY was put there to aid in the rigitiititittiiittttyyyyyywhywhywhy (it's 2am, i am tired) of the casting. But i could be wrong. Just a thought to add...\


    Charlie
     
    #25
  6. kylem40

    kylem40 New Member

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    how do I tel if mine is a xxx or yyy
     
    #26
  7. LiquidGT

    LiquidGT Member

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    Its in the valley, sorry for the tiny pic.
    This is an Explorer block, its the XXX... my original '91 block is a YYY.

    [​IMG]


    I dont think there's any difference in the XXX; YYY blocks I wasnt concerned about it when I swapped them. It probably denotes a different casting plant, or casting machine.
     
    #27
  8. kylem40

    kylem40 New Member

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    ok kewl thanks ill have look at that
     
    #28
  9. Mustang5L5

    Mustang5L5 Car used in adult film "Highway Gangbang-InDaButt"
    SN Certified Technician Founding Member

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    **** Star blocks!
     
    #29
  10. strtrcr50

    strtrcr50 New Member

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    A mexican block will say hecho in mexico in the lifter valley. Also, they are not roller blocks.
     
    #30

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