dodge 440 getting hot
1978 440 eng. In a 69 charger. Bored .030 with flattops. Small Hyd. cam, stock heads. Engine is fresh. Heads are not cracked, gaskets good. Street car. Manual fan, no clutch fan. Champion 4 row aluminum rad. First go round. Now has a champion 2 row. Both have same problem. Coolant only drops avg. 4 degrees as it passes thru. Any ideas? Thanks, kris