[62galaxiguy]

I bought this carb for my rebuilt ford 390and turning the idle mixture adjust screws in or out doesnt change idle quality .It doesnt go lean or rich it just stays the same.It was bought off a friend who used it last summer on his 55 ford 292 and at 600 cfm it was too much carb.Does it need a rebuild?It sounds like the power valve is bad to me.Thanks Mike