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Thread: 12 O'clock and 12 O'clock
          
   
   

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  1. #1
    Rdobbs1977's Avatar
    Rdobbs1977 is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 1972 Z28 Camaro Drag Car,2500lbs w/motor
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    12 O'clock and 12 O'clock

     



    At dot to dot on the timing set, I know number 1 is on TDC and my timing plate needs to reflect TDC at this point. However, am I correct in stating this: When both of my dots are at 12 O'clock and I drop distributor in, that distributor should be pointed at number 1 when I drop it in, correct? At 12 and 12, number 1 is set to fire, correct? It's been two years since we built an engine and now that we're working on this 355 (and soon a 383), I feel the need to refresh or confirm my memory. Thanks!
    1972 Z28 Camaro, Full Drag Car, 383 CID
    1976 Camaro
    Currently building a 1.21 Gigawatt Flux Capacitor

  2. #2
    34_40's Avatar
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    I think yours should look more like this.
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  3. #3
    Rdobbs1977's Avatar
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    I appreciate that 34_40. I know in this picture, my TDC on timing plate and balancer should be in alignment. My question is in that picture, #6 would be on the compression stroke, right? If I were to rotate crank one more time so both dots are at 12, that would put #1 on compression so that when I drop distr in, it will be pointing at #1, correct? Thanks,
    1972 Z28 Camaro, Full Drag Car, 383 CID
    1976 Camaro
    Currently building a 1.21 Gigawatt Flux Capacitor

  4. #4
    techinspector1's Avatar
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    Quote Originally Posted by Rdobbs1977 View Post
    I appreciate that 34_40. I know in this picture, my TDC on timing plate and balancer should be in alignment. My question is in that picture, #6 would be on the compression stroke, right? If I were to rotate crank one more time so both dots are at 12, that would put #1 on compression so that when I drop distr in, it will be pointing at #1, correct? Thanks,
    Correct. When you put the motor together and align the crank sprocket at noon and the cam sprocket at 6PM, the number 1 piston is at top dead center, but it is on the overlap, not ignition stroke. #6 will be at TDC also, because it is the companion cylinder to #1 and will be on the compression stroke and ready to fire. If you turn the crank one turn, 360 degrees, and put both sprockets at noon, #1 will be at TDC on compression and #6 will be at TDC on overlap. I've often wondered why the Chevy engineers did it that way. I do know that it is prone to error to try and align the cam sprocket at noon and the crank sprocket at noon. It's much simpler to align the cam at 6 and crank at noon and then turn the crank one turn to get the motor ready to drop the distributor in and begin with #1. Put the rotor at 5:30, run #1 and then run the rest of the wires clockwise around the cap.
    Last edited by techinspector1; 03-21-2016 at 07:18 PM.
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  5. #5
    jerry clayton's Avatar
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    somewhere back when v8s with cam/oilpump driven dist-----used 2 identical length lifters(back then called tappets) in the overlap cylinder(gm/mopar #6) with a straight edge across them would indicate split overlap------this was in a historic period of time before dual pattern camshafts----so this is where the cam crank was set up in the days before degree wheels and dial indicators

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