If you do not have the head on yet, and you know the connecting rod length and the stroke of the engine you can use trig calculate how far the piston would be from TDC to be 16 degrees. You could also mount a degree wheel, Find one at a HOT ROD shop, set the engine at TDC mount the wheel on the crank. Mount a pointer on the block and then back the crank up 16 degrees. Questions? send me an E-mail and I will send you my phone number.