Hi Kevin,Thanks for your reply. Nah, it is the auxilliary exhaust valve. Haven't found one yet. Apparently, you can get a reconditioned one but my guru mechanic tells me that they are inferior because the valve contains a bi-metallic strips which fatigues over time. The way they compensate for this when reconditioning is to change the air in the mix. I'll keep looking.
It's not the wheels that kill you, it's where you're standing!
other drives-jaguar XJS V12, Etype Series 1, XJ6, Jensen Intercepter II, Audi A6 3.0L supercharged, Audi Q7 oiler