Re: BBC Over heating?
Owner's Manual states a 195°F thermostat, both for SBC & BBC.
Probably could use a fan clutch, wouldn't hurt and a shroud.
I think the reason for rising temp when hood is closed is the air is recycling through the radiator.
Hood open, heated air exits out the top - feel the hot air on your face when it is above the air cleaner?
Hood closed, the normal escape route is filled with steel tubing, the space between the engine and frame rails. So air travels down in front of the engine to the ground, wraps around the radiator support and gets re-used.
Once car is moving, the engine compartment is at a lower atmospheric pressure than the front of radiator and higher pressure always equalizes the lower pressure area/volume.
BBC's create more heat then SBC's - more volume of combustion generates more heat.
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