Yeah but force is what lifts the head. So take your bore and get the area (3.86 squared=14.8996 X .7854= 11.702). So take 11.702 X the cylinder pressure and you get the force pushing up on the head per cylinder when it fires.
My theory is that the cylinder pressure is a function of fuel quantity, timing, air quantity, and the rate of burn, like a single shot vs pilot injection. Really I would think ebp would follow cylinder pressure somewhat. But the combustion spikes the pressure and then it drops as the piston goes down and then during the exhaust stroke it drops more
