Quote:
Originally posted by BOBTAIL
Ask yourself, why do ,say 96's seal better than 104's.
- More heat, same or less wall thickness?-
Its all about surface area, even stock cylinders leak.
So think about how to create more surface area on a 104
Think of an air filter, you know "pleated"?
Try machining a ridge on the top or say a series of grooves down the top sides of the barrel.
Keep thinking outside the box 
- Definately!, Porsche also used an extra seal in a groove on the sealing surface area cylinder/head of the 100mm (Nikasil) 964 cylinders...-
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Bobtail,
The more servere problem with the larger steel bores is IMO that due to the extra heat, which they cannot dissipate quickly enough, the barrels go too much out of round and become oval shaped so to say. I suppose this could/will give cylinder wall blow-by which might be as bad for power as head leaking. Curious what a set of Nickies of the same diameter would do for power on your car.
I do agree that the added ridge you have made on top of the steel 103's in your turbo bug (as you described many times) must work excellent! Compliments!
Walter