i always sweared by my amal valve, even brought a new one from ford!, but as soon as i took my car to APT they ripped it straight off, and installed a lockable,brass one,

Amal valve is now chucked in the bottom of my toolbox, havent had any problems since, as James said, Gary locked my bleed valve up, reisiting the tempatation of turning it up,

I think nowadays people who just chuck bleed valves on and whack the boost up, are just asking for trouble,

People who generally care for the cars, will leave their cars as setup by the experts, if not might aswell not bother with paying tuners to setup their cars.

After 16 psi, my amal valve just started making funny noises and playing up!