Glamour Shots.. '62 Valiant Wagon

slant six said

Maybe the way I had the plate mounted before blocked enough of the bottom of the radiator's airflow at high speeds to cause my problem? We will find out.

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I noticed the same with my 63 Belvedere. Installed the front licence plate and the running down the road temperature was 10+ degrees higher than without the plate. A restriction in air flow for sure. I have no front bumper or the lower valance on the car anymore but that plate in front of the lower part of the radiator was the culprit .