12 - Sparkie The Eel - I’ll Be Checking TDC From Now On 

I was trying to set the timing on a fresh Mercruiser 4.3 rebuild with Delco EST upgrade when I struggled to get it to run smooth. After replacing the distributor, the ignition module, the plug wires, and the plugs I finally played with the timing and got it running but the timing marks were way off so I checked and found that the balancer mark for TDC was way off. I made a new mark, set the timing to -2, now it runs very smooth.