Okay, that does seem a little on the slow side.

Try a different flasher. The '59 should be 12v (I'd be REALLY surprised if it weren't), so any old flasher should work. They aren't usually very expensive, either.

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1946 Chevrolet 3600 - "Old Number Seven"

Cavalry's Here. Cavalry's a frightened guy with a rock, but it's here.