302 XXX block

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


  1. stevesLX

    stevesLX Member

    Joined:
    Nov 12, 2006
    Messages:
    374
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    cincinnati
    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?
    #1
  2. Mustang78

    Mustang78 New Member

    Joined:
    Feb 8, 2006
    Messages:
    494
    Likes Received:
    1
    Trophy Points:
    0
    Location:
    Aberdeen, WA
    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~
    #2
  3. Shamus O'toole

    Shamus O'toole New Member

    Joined:
    Jul 3, 2007
    Messages:
    60
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Florida
    XXX is a hydraulic roller block. Nothing special........
    #3
  4. cenok is family

    cenok is family Active Member

    Joined:
    Jun 26, 2003
    Messages:
    1,401
    Likes Received:
    17
    Trophy Points:
    39
    Location:
    Norman, Ok
    what is a YYY?
    #4
  5. Mustang78

    Mustang78 New Member

    Joined:
    Feb 8, 2006
    Messages:
    494
    Likes Received:
    1
    Trophy Points:
    0
    Location:
    Aberdeen, WA
    flat tappet i'd assume

    ~Mark~
    #5
  6. Red88 RICK

    Red88 RICK Member

    Joined:
    Sep 2, 2006
    Messages:
    100
    Likes Received:
    0
    Trophy Points:
    17
    Location:
    Connecticut
    my block says yyy and its a roller.
    #6
  7. machstang23

    machstang23 New Member

    Joined:
    Apr 27, 2007
    Messages:
    13
    Likes Received:
    0
    Trophy Points:
    0
    there is no difference between the blocks, except that one has XXX and they other has YYY
    #7
  8. 95GTAODE

    95GTAODE New Member

    Joined:
    Nov 26, 2004
    Messages:
    200
    Likes Received:
    1
    Trophy Points:
    0
    +1

    The only difference is, it's more fun to say you have the infamous "porno" block! :D
    #8
  9. 85_SS_302_Coupe

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

    Joined:
    Nov 11, 2003
    Messages:
    170
    Likes Received:
    855
    Trophy Points:
    173
    Location:
    Northern KY
    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:
    #9
  10. TokyoJoe

    TokyoJoe New Member

    Joined:
    Mar 26, 2007
    Messages:
    190
    Likes Received:
    1
    Trophy Points:
    0
    Just means its good up to XXX horsepower
    #10
  11. Fast63

    Fast63 New Member

    Joined:
    Sep 20, 2007
    Messages:
    717
    Likes Received:
    0
    Trophy Points:
    0
    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
    #11
  12. Graydon5oh

    Graydon5oh Member

    Joined:
    Nov 24, 2002
    Messages:
    216
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    ARKANSAS
    i didnt know you were on here
    #12
  13. armyed

    armyed Member

    Joined:
    May 30, 2005
    Messages:
    39
    Likes Received:
    1
    Trophy Points:
    8
    Location:
    Atlanta Ga.
    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.
    #13
  14. stykthyn

    stykthyn Commander of the snuggie cultists

    Joined:
    Jul 6, 2006
    Messages:
    8,020
    Likes Received:
    570
    Trophy Points:
    163
    Location:
    gainesville
    my xxx block came out of a 5.0 exploder. definitely roller
    #14
  15. 85_SS_302_Coupe

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

    Joined:
    Nov 11, 2003
    Messages:
    170
    Likes Received:
    855
    Trophy Points:
    173
    Location:
    Northern KY

    Mine's a XXX and an '85 which was the first year for roller blocks.
    #15
  16. grey5.0beast

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

    Joined:
    Aug 3, 2004
    Messages:
    446
    Likes Received:
    39
    Trophy Points:
    0
    Location:
    atl ga
    xxx block here and a 91 roller
    #16
  17. blackened88lx

    blackened88lx Active Member

    Joined:
    Aug 10, 2006
    Messages:
    456
    Likes Received:
    16
    Trophy Points:
    28
    Location:
    Connecticut
    Mine says ZZZ :shrug:
    #17
  18. dtlionsfan

    dtlionsfan Member

    Joined:
    Nov 12, 2005
    Messages:
    118
    Likes Received:
    0
    Trophy Points:
    16
    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.
    #18
  19. Cobra912

    Cobra912 Active Member

    Joined:
    May 1, 2005
    Messages:
    1,863
    Likes Received:
    9
    Trophy Points:
    39
    Location:
    Wish I was anywhere but here
    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.
    #19
  20. bynummustang

    bynummustang Seen my other Jackstand?

    Joined:
    Jul 25, 2005
    Messages:
    2,156
    Likes Received:
    9
    Trophy Points:
    59
    Location:
    NC State University
    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
    #20

Share This Page