[Dadofour]

I have finally gotten to the point to begin timing my 3.2 Motronic.

I am using 964 grinds from John Doughtery.

I have my metric dial indicator setup, and am able to stop at exactly 1.26mm. My issue is when I pull the pin and rotate the crank back to TDC, the cam shaft moves.

How do I imobilize the cam shaft? The motronic cams are round. I'm not sure how I can stop them from rotating.

Thanks

Than