210° @ Cruise and 180° @ Stop? What's Going On?

famous bob said

I noticed you said "fiberglass hood" in one post. does it have a scoop? if it does, and it isn`t sealed to the carb., hiway speed air pressure from the scoop can pressurize the engine bay and actually stop air from flowing thru the radiator. had two hotrods do this, and also a friends 500' crate motored p/u.

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Interesting point. You're right - it is stock style fiberglass flat hood with a dual snorkel hood scoop. The center is cut out to the shape of the base of the scoop so as to let as much fresh air in as possible. (Spectre ExtraFlow air filter where the cover is also a filter) It's not sealed to the carb.

Might put some foam block in the scoop just to see if it makes a difference. Thanks for the suggestion.