At 10:24 PM 3/25/2007, you wrote:
>THE QUESTION: Does it sound like the missing piece is indeed the
>thermostat housing?  Did any years have some other part of the cooling
>system on the front end of the left head?

yes it's the thermostat housing, and no to your second question.  The
water pump is in the same place on both engines.  There should be 2
sensors hanging there in the vicinity of the thermostat housing.  One
for the FI system, and one for the coolant temp gauge in the dash.

Edward