and maybe Brian would let me have a copy of the relevant page(s) from his Weber bible?
No probs - I'll need to know the type number of the carb from the bottom flange where it's bolted to the manifold.
If I leave it ticking over for half an hour a puddle forms beneath the tail pipe.
For the first quarter hour that's normal - exhaust contains water vapour as combustion products and that condenses in the exhaust system. If you move it after a quarter hour and park it somewhere different (and the weather's not too cold for the exhaust system to warm up) does it still puddle ?
Compression test says the HG is ok for now.
so when I got it going the engine very briefly maxed out and I wondered if that weakened the gasket.
That happened to a Metro of mine when a vacuum pipe fell off and jammed the throttle full open - it was at full bore / no load for no more than 20 seconds (it's surprising how quickly you can reverse into a parking space when you have to

)
It was running very rough on the way home so I bought a 2nd hand head and new gasket on the way home. With the new head and gasket fitted it wouldn't start at all. Checked / replaced everything I could think of and still no joy - until for some reason I got the tappet clearance too large on one cylinder - then it started and spluttered along on one cylinder.
So I gave all the tappets a quarter-inch gap and it started and ran smoothly
I went around adjusting all the tappets until it started coughing and then eased the adjustments back to 'minimum gap for correct operation' - most were at least twice the gap they should have been.
I figured I'd damaged the camshaft but never did any further investigation - it ran ok and it was only a Metro
