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331 Hemi Timing

Discussion in 'The Hokey Ass Message Board' started by 36DodgeRam, Jun 1, 2011.

  1. 36DodgeRam
    Joined: Dec 16, 2008
    Posts: 505

    36DodgeRam
    Member

    I've finally got this 331 Hemi in my '36 pickup on the road, doing "test drives". I was playing with the timing, and it seems I have a lot of total advance. Set the timing at 10BTDC at idle with the vac advance unplugged. Timing goes to 16BTDC when vac advance is plugged in. When I rev it up good it shows 50BTDC on my new damper ! I'm used to Chevy's, never seen that much advance. Is this too much? Engine is fresh, has 8.5 Egge pistons and mild PAW cam. Thanks!
     
  2. 50-55 with the vacuum advance plugged in is about right. What you would be more concerned with is total WITHOUT Vacuum advance, as this what will do damge. Hemis have a very efficient chamber, so i would think 32-34 total would be good and shouldn't detonate.
     
  3. 36DodgeRam
    Joined: Dec 16, 2008
    Posts: 505

    36DodgeRam
    Member

    Thanks ajmopar!
     
  4. kc400
    Joined: Mar 17, 2011
    Posts: 30

    kc400
    Member
    from New York

    I just timed mine in last week and it is also at 10 BTDC at an idle with no vac advance hooked up.
     

  5. jbtine
    Joined: Nov 22, 2005
    Posts: 214

    jbtine
    Member

    Do you have that vacuum advance hooked to manifold vacuum or venturi vacuum? I am running a small block mopar distributor hooked to venturi vacuum with rochester 3 deuce setup on my 341 Desoto hemi.
     
  6. DYNODANNY
    Joined: Aug 9, 2006
    Posts: 1,411

    DYNODANNY
    Member

    I just checked my timing on thrusday and set it to 32 degrees total at 3 grand. I'm going to bump it it up in two degree increments until it feels right (going of the seat of my pants). I have the stock dizzy with a pretronix in it also set the plugs to .45 gap. Good luck man, post some video of it running.
     

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