They are talking about the original single groove water pump used in early AC setups. That used a tensioner pulley.

http://www.dodgecharger.com/forum/index.php?PHPSESSID=6pp10c63acmkrcu9jccp068m41&action=dlattach;topic=82987.0;attach=154732;image

Vice the later with AC setup

https://www.allpar.com/photos/vintage/1977/440-1977.jpg

Last edited by Supercuda; 07/07/18 02:44 PM.
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