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Boss 302 Block

Discussion in 'Newbie and Basic Turbo Tech Forum' started by prowler861, Jan 13, 2014.

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  1. prowler861

    Joined:
    Mar 5, 2008
    What horsepower can a Boss 302 block handle
     
    prowler861, Jan 13, 2014
    #1

  2. jt351

    Joined:
    Oct 9, 2005
    more than you can afford:) basically as much as you can spend.
     
    jt351, Jan 13, 2014
    #2

  3. Backdraft

    Joined:
    Jul 15, 2011
    How much HP do you want to make?
     
    Backdraft, Jan 14, 2014
    #3

  4. Weather Man

    Joined:
    Sep 28, 2013
    From what I see on S197forum, around 800HP. There is some evidence the blocks start cracking around 1000HP. JPC, MMR and JPC have some work arounds for the issue.
     
    Weather Man, Jan 14, 2014
    #4

  5. R_Williams

    Joined:
    Nov 9, 2010
    Depends on what your plans are for it.....................
     
    R_Williams, Jan 14, 2014
    #5

  6. sb3ll2013

    Joined:
    Sep 4, 2013
    Seen more than 800...
     
    sb3ll2013, Jan 14, 2014
    #6

  7. R_Williams

    Joined:
    Nov 9, 2010
    If youre planning on going over 1K Id go with a Dart personally.
     
    R_Williams, Jan 14, 2014
    #7

  8. sb3ll2013

    Joined:
    Sep 4, 2013
    ^^^Exactly what he said
     
    sb3ll2013, Jan 14, 2014
    #8

  9. fastspec2

    Joined:
    Dec 24, 2009
    My issue with the 8.2 deck blocks is the cylinders are too short. To make enough power with a 3.1 or shorter stroke you need to spin it that much harder wich may have an impact on the power level these blocks will live with. Maybe things have changed, but the boss 302 blocks i have used really hung the piston out of the cylinder at bdc with anything over a 3.1 stroke. I quit using them and started just going dart blocks.
     
    fastspec2, Jan 14, 2014
    #9

  10. 91turboterror

    Joined:
    Mar 17, 2013
    What engine are you talking about so it's clear? SBF based or the modular Boss 302 ?
     
    91turboterror, Jan 14, 2014
    #10

  11. R_Williams

    Joined:
    Nov 9, 2010
    Everybody I've talked to said don't go higher than a 331 with them because of that. I Know Ford sells them as 347 crate motors. Don't know if they've fixed that problem either.
     
    R_Williams, Jan 14, 2014
    #11

  12. 93AlexCoupe

    Joined:
    Oct 28, 2008
    Boss block 306, F cam, 80mm turbo, 8.7 - 8.8 @156 spinning to 6700. Using a cheap a/a, 220deg temps. Switching to a/w now hoping for 8.50s. Dont know how much hp but assuming over 800.
     
    93AlexCoupe, Jan 14, 2014
    #12

  13. R_Williams

    Joined:
    Nov 9, 2010
    Nice!
     
    R_Williams, Jan 14, 2014
    #13

  14. 93AlexCoupe

    Joined:
    Oct 28, 2008
    You can do a big bore 347, which is a 331 crank/ rods, but 4.125 on the bore.
     
    93AlexCoupe, Jan 14, 2014
    #14

  15. R_Williams

    Joined:
    Nov 9, 2010
    I think that's what the Ford crate motors are now that you mention it.
     
    R_Williams, Jan 14, 2014
    #15

  16. prowler861

    Joined:
    Mar 5, 2008
    I was interested in doing a 347 or 363 with a 4788 turbo but some of my friends only talk about Dart blocks. Never hear anyone mention Boss blocks
     
    prowler861, Jan 15, 2014
    #16

  17. R_Williams

    Joined:
    Nov 9, 2010
    Boss blocks aren't bad other than the short cylinders like you've heard above. That and I've heard you have to run a certain type head gasket on them. Other than that that's all I've heard negative about them. On the other hand I've never heard anything negative about the Darts..........
     
    R_Williams, Jan 15, 2014
    #17

  18. 93AlexCoupe

    Joined:
    Oct 28, 2008
    For that ci, then a dart would be the better choice.
     
    93AlexCoupe, Jan 15, 2014
    #18

  19. prowler861

    Joined:
    Mar 5, 2008
    I have seen a lot cars with the R block making great power that why I ask about the Boss block
     
    prowler861, Jan 15, 2014
    #19

  20. R_Williams

    Joined:
    Nov 9, 2010
    The Boss pretty much just replaced the R. I've heard of people turning 1200hp with an R but don't know if that's pushing it's limits though
     
    R_Williams, Jan 15, 2014
    #20
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