Trying to remember why that was....did the oil cooler block the air...or? There was some reason for it. The other thing that killed these was not having the foam gasket around engine tin and body work and not having the hoses from the shroud to heater boxes or blocking them off, the movement of air within the shroud is critical, there were some flaps in there as well if they got hung up it was bad for the engine as well. Man this is an analog flashback... ;D