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BBC timing

Discussion in 'The Hokey Ass Message Board' started by Kubbee47, Jun 30, 2010.

  1. Kubbee47
    Joined: Mar 27, 2008
    Posts: 92

    Kubbee47
    Member
    from minnesota

    OK motor heads. The BBC in the 48 seems to run best at 22 degrees initial and 41 degrees total. The cam has a 244 duration @50 and is a hyd. roller with 560 lift. with a dual quad
    Seems like a lot of initial, but if I back off it stumbles on standing wot. No pinging or heating isses, just runs graet at this timing.
    Any thoughts if this is an issue?

    Gary
     
  2. Initial sounds a little high, but a BBC expert that helped me build my 480 told me that they like around 38 total, so you're not that far off. Maybe try grinding the stops a bit on the rotor weights to get more centrifugal advance so you can back the initial off a bit.

    Guess if it will start at 22, no harm no foul..
     
  3. CONNMAN
    Joined: Jul 19, 2006
    Posts: 1,297

    CONNMAN
    Member
    from Lampe,Mo.

    Ran my old BB's at 42 degrees total ,18 degrees initial with the distributor set a 24 degrees coming in at 3000 rpm ,,if yours starts and runs good as it is ,,,leave it alone and run it ,,
     
  4. Glen
    Joined: Mar 21, 2001
    Posts: 1,789

    Glen
    Member

    I ran 20 initial and total 38 in mine, 40 is fine if it doesn't ping
     
  5. Black_Sheep
    Joined: May 22, 2010
    Posts: 1,499

    Black_Sheep
    Member

    I run 20 initial and 38 total in my 292/.509 cammed 440 with no ill effects.

    If your Chevy runs good then go with it...
     

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