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291 DeSoto hemi on the dyno today, fired for the first time VIDEO

Discussion in 'The Hokey Ass Message Board' started by Minewithnoshine, Jun 24, 2011.

  1. WOW 270 ".050 thats an assload of duration for a 303! I bet it would make more with more rpm...very nice congrates..
     
  2. jimi'shemi291
    Joined: Jan 21, 2009
    Posts: 9,499

    jimi'shemi291
    Member

    Right! That cam must have cost a mint, and I have to believe more push than the original stock valve springs supplied (even though, as I recall, they were doubles)..


    And, SORRY, NoShine, I missed your mention of the Ross forged pistons, even on the reread. My brain is getting OLD!
     
  3. russd
    Joined: Nov 17, 2007
    Posts: 113

    russd
    Member

    sounds really nice.
     
  4. krooser
    Joined: Jul 25, 2004
    Posts: 4,585

    krooser
    Member

    Did they break in the cam? Just wonderin'....
     
  5. 73RR
    Joined: Jan 29, 2007
    Posts: 6,236

    73RR
    Member


    It is a roller so no break-in needed.

    .
     
  6. Minewithnoshine
    Joined: May 17, 2007
    Posts: 938

    Minewithnoshine
    Member

    Thanks for the comments everyone!

    Jimi- The heads are straight bolt on, they received some mild port work, but nothing crazy. The springs are dual springs now with chromoly retainers and stainless valves, stock 1.94 intake and 1.75 exhaust, a BIG upgrade from 276/291 heads.

    As for the bottom end, forged Ross slugs like you saw and stock rods shot peened and ARP rod bolts added. The crank was micropolished, turned 10/10 just for a nice cleanup and the oiling holes were chamfered. It makes GREAT oil pressure and runs nice and cool.

    I'll see if I can get a dyno sheet posted up on here for you all.

    Thanks again!
     
  7. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Minewithnoshine, were you able to come up with any flow bench numbers? I'd REALLY like to see them if possible. Personally, I'd be more interested in the flow #'s than the dyno sheets. Also, what did the chambers cc at? Thanks for any info.
     
    Last edited: Jul 11, 2011
  8. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Also wondering if anyone can tell me how much bigger (if at all) the ports are in the tall deck heads than the 276/291 heads. I am aware of the valve sizes, asking about the ports themselves.
     
  9. gearheadbill
    Joined: Oct 11, 2002
    Posts: 1,283

    gearheadbill
    Member

    Your sedan is gonna MOVE!! love it.
     
  10. Minewithnoshine
    Joined: May 17, 2007
    Posts: 938

    Minewithnoshine
    Member

    The diameter of the port is a LOT bigger on the 330 heads, just in stock form. I have some pictures of the stock exhaust manifolds, and the diameter is a good 1/4-3/8" bigger on the 330 heads. The headers I had before used 1 1/2" primaries and the 330 heads were a touch over 1 3/4" stock.

    I just hope it does justice to the body! It's coming along great!
     
  11. 63FalconFutura
    Joined: Feb 18, 2010
    Posts: 308

    63FalconFutura
    Member
    from Socal

  12. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Thanks for the info.
     
  13. jimi'shemi291
    Joined: Jan 21, 2009
    Posts: 9,499

    jimi'shemi291
    Member

    Dude, I hope you keep the "DeSoto" plug-wire covers. Even under normal circumstances, a DeS HEMI is nothing to hide.:p

    And YOURS is no shrinking violet! :eek: LOL:D
     
  14. scootermcrad
    Joined: Sep 20, 2005
    Posts: 12,301

    scootermcrad
    ALLIANCE MEMBER

    Bitchin' Firedome!!! Love it!
     
  15. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    The potential problem with the plug wire covers is inductive cross-fire across 5 and 7. You could look at using some of this stuff on those two wires where they are in close proximity to each other under the covers. I realize its not period correct, but it would be hidden under the covers, so its worth considering.

    http://www.msdignition.com/Products...Heat_Guard,_Hi-Temp_Silicone_Sleeve,_25_.aspx
     
  16. jimi'shemi291
    Joined: Jan 21, 2009
    Posts: 9,499

    jimi'shemi291
    Member

    Good point, AND good suggestion! :eek: I love 'em, 'cause they keep the defunct DeSoto name proudly out there -- still crankin'! -- and it's such a NEAT package. And trad, too.

    I never had the crossfire problem on my 291 Fireflite, BUT then, I wasn't running the ignition system that NoShine will be. :D
     
  17. CollegeKid
    Joined: Dec 13, 2009
    Posts: 70

    CollegeKid
    Member
    from Minnesota

  18. jtille
    Joined: Sep 23, 2008
    Posts: 303

    jtille
    Member

    WOW!!! Sounds Amazing even on these laptop speakers.....I can only think of it would sound like sitting behind it!!!
     
  19. jtille
    Joined: Sep 23, 2008
    Posts: 303

    jtille
    Member

    I watch this clip about 3 or 4 times a week!!!! AWESOME!!!
     
  20. EARLYHEMIBILL
    Joined: Apr 7, 2008
    Posts: 465

    EARLYHEMIBILL
    Member
    from ?

    What's the latest on the motor?
     
  21. Bert Kollar
    Joined: Jan 10, 2007
    Posts: 924

    Bert Kollar
    Member

    Sweet engine, makes me more anxious to fire up my Dodge 270. Mines a little milder but still expecting 275 HP
     

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  22. Atwater Mike
    Joined: May 31, 2002
    Posts: 9,802

    Atwater Mike
    ALLIANCE MEMBER

    I have a 276 DeSoto, nice engine, ready to go through. Crank Std./Std.

    Need info on Ross pistons...(best place to order, and is that 10.5:1 compression ratio a 'stocked number'?)
    Can't seem to find a catalog page on Dodge/DeSoto Hemi pistons for Ross...
     
  23. EARLYHEMIBILL
    Joined: Apr 7, 2008
    Posts: 465

    EARLYHEMIBILL
    Member
    from ?

    Mike, try Venolia. I got pistons from Ross and Venolia. Venolia was about $100 cheaper. Bill
     
  24. 73RR
    Joined: Jan 29, 2007
    Posts: 6,236

    73RR
    Member

    I do not believe that any of the custom piston shops stock anything for the DeSoto or Dodge engines. Simply not enough demand...
    If you want another option I sell AutoTec forgings, and like the others, you won't find anything listed on the web site for these engines.


    .
     
  25. RatrodKevin
    Joined: Apr 17, 2013
    Posts: 31

    RatrodKevin
    Member

    nice!!:} seen a 291 with that intake on Oregon craigslist for 1200... wish it was closer home...
     

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