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Help with 350 small block tuning. ?!?

Discussion in 'The Hokey Ass Message Board' started by luapsed, Apr 27, 2013.

  1. luapsed
    Joined: Jun 2, 2012
    Posts: 22

    luapsed
    Member
    from Fords, NJ

    I have a 72 small block 350 Corvette motor that had a basic engine rebuild. Stock pistons, stock heads, stock cam. The only mods are a streetmaster manifold, holley 600 and I put a Hei distributor on it. I timed the motor to 8 degree btdc and it seems I have hesitation on my take offs , but at about 3500 to 4000 she really takes off. I had the timing way off like 14 btdc and it seemed to run better. I shot the timing and plugged the vacuum advance when I shot the timing and plugged the hose to carb. I'd like my acceleration off the line to be more responsive. Any suggestions or advice or insults appreciated. :confused:
     
  2. Hubbcat
    Joined: Oct 15, 2002
    Posts: 561

    Hubbcat
    Member
    from Sweden

  3. luapsed
    Joined: Jun 2, 2012
    Posts: 22

    luapsed
    Member
    from Fords, NJ

    To add the plugs are stock and gapped to .045 and new 8mm wires.
     
  4. You need to confirm your timing marks with a piston stop test , your light is telling you stories . Balancer rings move and there's quite a few different cover, pointer, and balancer configurations

    Or time it by ear and seat of the pants and forget the light
     

  5. BLAKE
    Joined: Aug 10, 2002
    Posts: 2,776

    BLAKE
    Member

    Assuming you trust your timing marks, I'd plug the vacuum advance and set the initial at about 16-deg BTDC... then hook up the advance and see what the curve looks like thru the RPMs. Kill it and see how easily it restarts. Drive it and see if pings under load (too much adv). You also have a choice between hooking the vac advance to full manifold or ported vacuum... the only difference being whether you see static or vac advanced timing at idle. Many folks call for no more than 36-deg total advance, and to have it all in by 2500 or so... but I just went with what felt right after LOTS of driving and tweaking.
     
  6. henry29
    Joined: Sep 5, 2007
    Posts: 2,837

    henry29
    Member

    You can time it by vacuum
     

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