302 XXX block

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


  1. stevesLX

    stevesLX Member

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    So is there anything special about a XXX block VS a YYY block? Is one better than the other or is it just the same thing with differn't cating #'s?
  2. Mustang78

    Mustang78 New Member

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    i thought XXX was roller and YYY is flat tappet, or the other way around...i asked this before(try using the search button), from what i know it has nothing to do with the strength of the block itself, so just pick the better candidate for the build based on measurements of the bore, and crank/rod journals, not to mention if the block is cracked, etc..

    ~Mark~


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  3. Shamus O'toole

    Shamus O'toole New Member

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    XXX is a hydraulic roller block. Nothing special........
  4. cenok is family

    cenok is family Active Member

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    what is a YYY?
  5. Mustang78

    Mustang78 New Member

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    flat tappet i'd assume

    ~Mark~
  6. Red88 RICK

    Red88 RICK Member

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    my block says yyy and its a roller.
  7. machstang23

    machstang23 New Member

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    there is no difference between the blocks, except that one has XXX and they other has YYY
  8. 95GTAODE

    95GTAODE New Member

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    +1

    The only difference is, it's more fun to say you have the infamous "porno" block! :D
  9. 85_SS_302_Coupe

    85_SS_302_Coupe it sucks (I know) to be on the receiving end

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    No way it's the Vin Diesel block...officially endorsed by the movie XXX. Or maybe it's a Straight Edge block and doesn't drink or do drugs :shrug:
  10. TokyoJoe

    TokyoJoe New Member

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    Just means its good up to XXX horsepower
  11. Fast63

    Fast63 New Member

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    right, there is no difference. I think XXX is just an earlier roller block, like the one in my 85 stang, and YYY is newer, like my 91 block 347
  12. Graydon5oh

    Graydon5oh Member

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    i didnt know you were on here
  13. armyed

    armyed Member

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    if im not mistaken the xxx block was a non roller block. My block is from a 78 ford truck and it was a non roller before and it has the xxx on the webbing. I also believe they are a little stronger then the rollers as the webbing was a little thicker.
  14. stykthyn

    stykthyn Commander of the snuggie cultists

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    my xxx block came out of a 5.0 exploder. definitely roller
  15. 85_SS_302_Coupe

    85_SS_302_Coupe it sucks (I know) to be on the receiving end

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    Mine's a XXX and an '85 which was the first year for roller blocks.
  16. grey5.0beast

    grey5.0beast Cookies should never be DUNKED!!!

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    xxx block here and a 91 roller
  17. blackened88lx

    blackened88lx Active Member

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    Mine says ZZZ :shrug:
  18. dtlionsfan

    dtlionsfan Member

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    I have a YYY block in my original 89 and have done an 88 and 92 original mustang roller blocks and they were XXX.Theres no rhyme or reason to them.
  19. Cobra912

    Cobra912 Active Member

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    Well I can't quote where I read it but I believe they are the same however the YYY blocks are believed to have a higher nickel content which allegedly makes them stronger......how much or how true I couldn't tell ya but I do recall reading it somewhere.

    My 86 had a xxx and the 331 I'm building is a yyy and they are both rollers.
  20. bynummustang

    bynummustang Seen my other Jackstand?

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    Best answer yet.

    The YYY blocks were cast in Mexico (they did something right), and the castings done there, are said to have a higher Nickel content, thus making them stronger. I'm not sure, and no one is sure on how much stronger, but I still wouldn't want to push more than 425 or so on any stock production type block.


    /thread

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