Trick question
 

Hello to all honorable forum.
i have a trick question ......my case is *6403090* and i have the craziest idea
can i fit 107 mm liners and turbo piston from 993?
will it fit? do i need to change the heads as well?will it work with 930 single turbo headers?
please say and write all you think of give me all of your knowledge
THX

Cylinders..........
 

I would give the guys at LN Engineering a call. They can tell you what can be made to fit and what can't. I know that they make slip fit 100mm cylinders for the 3.0 and 3.2 liter blocks. I think that everything from 102mm and up requires machining the spigots in the block. Good luck building your monster motor!

6403090 would be a 914-6 case. So, unless you have a typo, I'm going to say no
chance.

If a 914-6 case (basically same as the T), not a chance. 93mm is as wide as you can go. The 3.0 cases have a wider stud spacing, which allows the spigot to be wider, which allows wider cylinders.