I have a 350 that over heats when I run it over 50 mph. She is fine at lower speeds. The engine also loses oil pressure when it gets hot. I am planning on tightening the main bearing bolts this fall. I have taken the hood off to get better air flow and still the same problem.

Waggy
Chev- Sedan 36,Apache 59,Longhorn 69, Chrysler 300 - 1970 conv, Ford Prefect 49, International L130 1950
Surrey, BC, Canada