VW Engine Bore Size Question

Is the machining made to cases and heads to accomodate 90.5 mm pistons the same size as for 92 mm pistons? I read that in a recent VW Trends and just want to corroborate it with all the knowledgeable folks here. Thanks for your clarifications!

Yup. unless you get thickwall 92's

Do you have any infromation on this upgrade? Moreover, what will it cost to make the change? In addition what will be attained by the change in raw h/p. George/ Jake or anyone, can you anwser this question?
Thank you.
DS

Thanks for the reply Pat! Can You elaborate on the thickwalls? I've never heard of thickwall 92's....at least on the VW mags that I read I can't find any reference to those.

Ricardo, some general information of cylinder size: 90.5s, one time, were prefered over 94s, because they lasted longer. From what I've read/heard, this doesn't seem to be the case anymore. 94s may run a little hotter, but that doesn't seem to be an issue. Run 90.5s or have your case bored for the 94s. Don't run 92s, thick walled or not.
Ron

I would prefer 90.5's in my case (no pun intended) because they seem to be the perfect compromise between reliability and a little more power; at least from what I've read on some recent VW mags. I want something mildly altered that won't be expected to give me any extra headaches and the 90.5's seem to fit the bill. I'm asking this question because I'm in the process of buying a used Speedster and one of the ones I'm interested in is equipped with a recently built (approx. 3 yrs. old) 1835. I just want to know if I can equip that same block with 90.5's come rebuild time.