[Land-speed] Cold start valve question

[Kirkwood]

My "cold start" comes in a can from the hardware store.  Ether!  :-)

 

From: Greg Meyers <advo at comcast.net>

. . . Anybody ever use a cold start valve to help light things off or to
temporarily richen the mix?  How well do these valves work with 8 psi?

Thanks