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Any tips on removing stubborn brass drain screws on float bowls?

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Tomb:
I used a gas soldering iron as a blow torch, the best thing for carbs as the heat can be used VERY locally on what you're trying to remove without risk of damage to the aluminium parts.

kevski:
That's the size of the threads on the thou's bowls, i even made new bowl screws out of brass, heads 5mm thick and a 2mm slot 3mm deep, these won't stay locked in.

mike the bike:
As above with the heat, diesel etc, before trying to loosen them, see if they'll tighten up slightly first - just to crack the seal.
Usually the tightening side of the slot is in better nick than the loosening side and the screwdriver will have a better purchase.

Moorey:
If you don't have a large hollow ground screwdriver use a piece of flat plate steel as near the thickness of the screw slot width as you can. It's far less likely to cam out of the slot and is easier to turn. Fasten bowls in a vice and heat the screw.  ;)

ka-ja:
Plenty of heat and them douse with cold water, trying to leave the bowls hot.

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