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Hi Shawn, I don't recommend reusing a case that needs to be align-bored. These cases were not designed to be reused and align-boring can not be done as well as in the VW factory. This will lead to misalignment of the crank in the case. This in turn leads to premature flywheel seal wear, piston ring wear (which will produce blow-by and internal case pressure) and increased friction which means it will run hotter. IMHO it doesn't save you any money in the long run to use an align-bored case. Who wants to rebuild an engine before you need to? As for the increased displacement, I don't see a problem as long as you keep a good compression ratio for the fuel used and keep the original thermostat stuff. Anybody else out there have additional thoughts? james > I am in the process of starting to rebuild my 66 Fastback engine. The > motor needs to be alignbored .020. I would like to bump it up abit to > 1641. Are there any suggestions as to what are the best pieces to use? I > will gladly read all thoughts, and let you know what I decide!!