Originally Posted by
ECU Monitor Enthusiast
Well, from my experience I certainly disagree !
I have removed several brass type bleed valves to fit an amal type valve in place with simple on/off control and the stability issues dissapeared.
You will probably find that those cars had too large a boost adjustment made to them by the bleed valve or were incorrectly fitted by someone. Amal valves score over the cheaper valves by their ability to be jetted which can aleviate some such problems. More expensive ones are also jetted.