because the pulley is resting against the oil pump gear and not the spacer. The de/det spacer doesnt protrude out of the pump for the pulley to stop against. So it hits the gear and if you torque it down your pushing on the gear. If you didnt torque it down at all your fine. Just get the adapter from Greg v that goes on along with your original spacer and be fine. Or find a ve spacer and take your original out. However good luck with the cover on getting the original out. So thats why i suggest the addition of Greg V's spacer. Simple and can be installed with the cover in place. Other than that pretty simple.