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Firing order change SBC

Discussion in 'The Hokey Ass Message Board' started by bigalturk1, Jul 8, 2011.

  1. Actually, no it doesn't. To do that, you'd need to go to a flat-plane crankshaft. It just moves the point in the firing order where you find the "L L" or the "R R".


    1 8 4 3 6 5 7 2
    L R R L R L L R

    1 8 7 3 6 5 4 2
    L R L L R L R R
     
  2. SLCK64
    Joined: Oct 4, 2009
    Posts: 493

    SLCK64
    Member

    Heres the article, I took pics of it---(mods if this isnt legal you can delete if you choose)

    1) [​IMG]

    2) [​IMG]

    3) [​IMG]
     
  3. gas pumper
    Joined: Aug 13, 2007
    Posts: 2,953

    gas pumper
    Member

    You get rid of the 5-7 next to each other, but then you have 4-2 next to each other. Just moving the intake problem to the other side.

    Our engine guy for The AA/GL does it this way, 7-4 swap, because he thinks it keeps 5 and 7 cooler and more even with the other s. He says on the big 582 that we run that the power is the same but he gets better temps in the head and block this way. For a 5 mile pull this is important.
     
  4. badshifter
    Joined: Apr 28, 2006
    Posts: 3,277

    badshifter
    Member

    On a street driven or even street/strip you won't gain or feel ANYTHING. In 17 years of stock and superstock racing it goes in and out of fashion. Some combinations it helps, some it does not. For your application all it will do is lighten your wallet. But since you asked, you need the cam, and to swap plug wires. And, it won't and does not sound different. Headers that follow the firing order to their collectors will make that indy car sound, and they have come and gone as well. But they do look cool all spaghettied all over the place.
     
  5. classic gary
    Joined: Sep 24, 2009
    Posts: 497

    classic gary
    Member

    changing the firing order is kinda like putting MerCruiser valve covers on a SBC............
     
  6. rodhot
    Joined: Feb 19, 2010
    Posts: 61

    rodhot
    Member

  7. I Drag
    Joined: Apr 11, 2007
    Posts: 884

    I Drag
    Member

    I know ONE GUY that does the 4/7 swap. Yes, it is worth hp on a Comp Eliminator motor that makes 900+ hp @ 10,500 rpm. I assume this is.....not you.

    If you do not index your plugs, have all titanium fasteners, have all ceramic bearings, have all magnesium body panels, have no water in the block, etc, you have many other places to start.

    But knock yourself out, whatever.
     
  8. Dapostman
    Joined: Apr 24, 2011
    Posts: 294

    Dapostman
    Member

    For some real confusion, try a monoplane crank, like the Novi.
     
  9. Brad54
    Joined: Apr 15, 2004
    Posts: 6,012

    Brad54
    Member
    from Atl Ga

    This is a popular swap with 426-based Hemi race engines... I've heard of a couple Factory Appearing/Stock Tire guys doing it.

    -Brad
     

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