I did the tbi to 2.5 T1 swap a couple of weeks ago in my 88' reliant wagon. So after driving it now for awhile I noticed it seems to cool more efficiently than my tbi set-up. Everything is the exact same, except for the reverse coolant flow of the 89' donor motor. The motor size is the same, same rad, and same used coolant. I run a mechanical temp gauge in my car so I am always looking at it.Plus my old motor was good too it never ran over 170. Did the reverse flow really make that much difference?