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Help with installing timing tab on 350 chevy

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  • Help with installing timing tab on 350 chevy

    I replaced my timing cover with one that has no marks so I am going with a bolt on non adjustable tab. I am little confused but this is what I am going to do and I am not sure it is right. The tab is a Mildon 65507 model for a 7" balancer. It mounts on side of the timing cover. This is what I plan to do.
    Get # 1 coming up towards tdc. Install my piston stop too in cylinder. Roll it up by hand until it is against the tdc tool and mark the timing tab at 0 degrees on the harmonic balancer.. Then I will roll the motor backwards until it comes in contact with the tdc again. I will then mark the harmonic balancer again at o degrees. From my understanding the point between these two points will be true top dead center. I will then put me a small line on the harmonic balancer marking this point.
    Now my question is when I remove the tdc tool and roll the motor back forward, when my line is on O degrees on my timing tab will that be top dead center. Can't seem to understand this.

    If anybody can explain this I would appreciate. Seems like to me what I said would be how to do it but not sure. Thanks

  • #2
    the outline you laid out above is the correct way to find the true TDC mark on the damper.

    now you can install a stick-on tape style degree marker, or have a machine shop mark it out with grooves into the surface of the damper.

    usually you would mark it every 2 degrees form TDC to 60 degrees before TDC, then a mark at 90 deg., 180 deg., and at 270 deg.

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    • #3
      Install your non adjustable timing tab and rotate engine clockwise until the 0 on your crankshaft damper is on 4 degrees BTDC. set your piston stop. now rotate you engine counter clockwise until it hits the piston stop again. Your tab should show 4 degrees ATDC. The difference between the two should be the 0. If the piston stops at something like 6 degrees ATDC, your non adjustable tab would be off by 1 degree or half the difference between 4 and 6 degrees. As long as the 7" tab is a match for crankshaft pulley,
      it should be right on unless your crankshaft key is offset.
      Last edited by ls1; 06-11-2016, 04:34 AM.

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      • #4
        Just realized on my post I put 350 cu in instead of 305cu in. I have a 305. Installed my new timing tab today. It is the one I would say at about the 2:00 position. Really do like it. This is what I did. Got the #1 on compression ready to fire. Almost to the top of travel. Then I put my piston stop in and rolled it on clockwise until I felt it stop. Then I marked a mark at 0 degrees on the damper. Then I rolled the motor backwards until I contacted the piston stop again and put another mark on the damper at 0 degrees. I measured between two and it was 2 1/4 inches. I split the difference and made a good mark on the damper. Fired it up and showed 6 degrees before tdc which is about what I figured. I just didn't understand that I was establishing and new mark on the damper at tdc to go with my new tab. It seems like all the article I read just said to put a mark on the damper but not where. I think I have it now. Now to play with the carb some. I had put a thread about help with edelbrock 1405 carb. Going to lean it down a little.

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