Overheating and fed up....

[Mike..Yorba Linda]

OK, did some testing.....first checked that water flowed freely through block and that passed, flowed right through. Then did what B-O-B suggested with upper hoses and fan belt off. Saw a burping in the water on the pass side nothing on the driver but driver got 10* hotter and water would overflow the pump flange while pass. side did not. Didn't see any large bubbles on driver side. Any more test suggestions before pulling the heads? Thanks....