Air flow in 550 Spyders

I am wondering if anyone knows how the air flow in a Spyder is supposed to work. Lots of old photos have a small grille under the nose for an oil cooler. So where was the exhaust? The rear is even more confusing. The grilles on the rear deck are in an aerodynamic low pressure area so are they for exhaust? The fan on the engine would seem to draw from the same low pressure body cavity. Finally the carbs, which seem to have no air box, also draw from this cavity. None of this probably makes any difference but I gotta know.

THX

Tim

The original Spyder had the grill, which is present on every SPyder Replica. (most are closed or use a fake cover to give the illusion that it's an oil cooler grill. On the original Spyder, the back of the cooler was open to exhaust the hot air. On some special race models, they had vents that opened and closed so the driver could get oil temps up and keep them under control during a race.

The rear vents on a Spyder acted as an exhaust as the bottom of the car had a complete belly pan that louvered air into the engine compartment.

Later cars added rear vents near the tail lights to help exhaust air from the engine compartment.