Heater Cutoff?

[luvbowties]

Originally Posted by Clyde65

Put a valve on in and out at the heater hose under the hood, most of us do this so the AC can run optimally.

http://www.autozone.com/autozone/par...alve/_/N-91sh0

Hey Clyde, just noticed u suggested using 2--one on each hose. Just for info that I lack, why both? (...or is that only for the fortunate few members who also have fuel-injection??!!)
Thanks for the help, and still hoping for F-I, some day, on my '66 with stock, yet carb'd, vortec.
Sam