Join Date: Mar 2002
Location: Austin, TX, USA
Where did the power valve come from? Sounds like it might be blown. Holleys are famous for blowing power valves. The valve has a small rubber diaphram. One good back-fire and the rubbber diaphram will get a hole blown in it. Newer carbs have a little check ball in the power valve circuit that is supposed to prevent this. There are also kits that can be installed in older cars. In any event, if the power valve is blown it will idle rich.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI