You beat me to this one, Stuart.  Over the bench in the garage, I have a piston from #3 in a 1500sp which serves to remind what happens if the deck height is too low :(

On 27-Mar-2015, at 21:00, Stuart MacMillan wrote:

> I'm sure others have more useful advice, but the one thing I know from my
> air cooled days is that deck height is critical for the proper compression
> ratio.  If you lap them in, you may need to raise the deck height using
> shims between the jugs and the case.  An experienced VW machinist should
> know what to do, but that would not be anyone under 50.  Probably 60.
> 
> I burned up a 1600 engine by not paying attention to this years ago, but
> maybe the 2.0 is more forgiving.
> 
> Stuart
>