Run the water pump faster perhaps? Make sure your system and cap hold pressure.
The only time I have had overheating issues was with a 4 inch bore stroked 250 with block fill about halfway up. Not sure if the block fill or thin cylinder walls were to blame. This was in a '72 Nova. I tried various thermostats, drilled or not, various fans and shrouds, under chin spoiler, nothing seemed to matter. Running a big 3 row brass factory radiator from a later model Nova that is about 4 inches wider than original for my car. Never boiled over but ran hotter than I liked.
Overheating went away when I went back to 3.935 (0.060) bore and open water jackets.
Last edited by strokersix; 04/27/16 01:51 PM.
