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Thread: SBC Timing

  1. #1
    Join Date
    Nov 2010
    Location
    Australia
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    Default SBC Timing

    Hey experts need your advice.
    My 56 has a 350 with high compresion pistons a mild cam etc 730 holley I have installed a MSD dizzy replacing the twin point mallory.
    According to the previous owner the idle timing was set at 4deg btdc.
    I set the timing at 4 with the MSD and on start it sounded like the cranck was going to break.
    I then set the timing at 12 btdc started fine and then adjusted it to 10 btdc.
    Took it for a spin and no pinging.
    So my question is does the timeing at 10 deg btdc sound about right?

    Thanks guys

    Mick

  2. Default

    Could well be as you don't know how the cam was installed. I would say if it performs the way you like it leave it be.. The dual point could have had a wide enough spread to make up the differance.
    Enjoying what I get to do everyday PLAYING IN MY SHOP
    www.fishertrains94.webs.com
    Every one needs a hobby I have 3
    W8AMR
    Laus Deo

  3. #3
    Join Date
    Nov 2010
    Location
    Australia
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    Default

    Thanks for the reply mate yes it runs alright at 10 will leave it alone for a while.
    Mick

  4. #4
    Join Date
    Nov 2010
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    Australia
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    Default

    Now have it at 14 deg btdc perfect.
    Mick

  5. #5
    Join Date
    Oct 2009
    Location
    Danville PA.
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    Default

    Glad it worked out for ya Mick, is it a 4spd or auto, just curious...
    Thanks Steve


    'Stop telling God how big your storm is.
    Instead, tell the storm how big your God is!'

  6. #6
    Join Date
    Nov 2010
    Location
    Australia
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    Default

    Auto mate T400.
    Was having trouble getting out of the hole off the line a lot better now but still not right after testing last night will go back to 12 btdc.
    For some reason at 14 we couldn't get the carbi mixture set right blowing fuel out the exhausts. fuel presure set at 6.5 psi using a holley blue elec pump 730 holley vac sec.
    On take off its not crisp the engine sounds like it is chugging untill the revs are up?

    Mick

  7. #7
    Join Date
    Nov 2010
    Location
    Australia
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    Default

    Well I found the problem with the 56. I bought a 2in spacer block to fit under the carbie (780 holley) and when I removed the carbie it had the wrong gasket fitted.
    Where the fuel squirts from the carbie into the manafold had gasket covering it. The gasket had 4 holes in it the size of an Australian 10cent peice or I think the same as your 1/4.
    Put the spacer block on and a new proper gasket and man hang on.
    Mick

  8. Default

    If they can't breath they won't run
    Enjoying what I get to do everyday PLAYING IN MY SHOP
    www.fishertrains94.webs.com
    Every one needs a hobby I have 3
    W8AMR
    Laus Deo

  9. #9

    Default

    Quote Originally Posted by micks56 View Post
    Thanks for the reply mate yes it runs alright at 10 will leave it alone for a while.
    Mick
    i just have one noob question. im just curious what will be the benefit of making it to 14dec if it runs okay at 10? it might just give you problems in the end. what will i gain from changing it to 14?

  10. Default

    You could gain a knock or not start you don't want it firing to soon before the piston is at the top
    Enjoying what I get to do everyday PLAYING IN MY SHOP
    www.fishertrains94.webs.com
    Every one needs a hobby I have 3
    W8AMR
    Laus Deo

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