The term "blueprinting" is not as big a deal with Porsche engines as they are built to a very high level of tolerance at the factory. During a normal rebuild, you just need to pay attention to the "usual" build list (correct head studs, etc.) and check/verify the regular clearances before assembly.
However, if one were to make sure the engine is put together "as designed", then you could perform the following:
- verify and equalize combustion chamber volume ( and thus compression ratio)
- verify and equalize deck height and cylinder height
- verify and equalize connecting rod lengths
- verify and equalize reciprocating/rotating weights ("balance" the engine)
- cross drill the crank journal oil passages
- micro-polish crankshaft main and rod journals
- match the port dimensions at the intake manifold-to-cylinder head juncture.
- Verify proper valve spring pressure and installed height
- Verify and adjust valve-to-piston clearance
- Lighten piston and connecting rod
- Replace reciprocating weight with lighter components (e.g. ti con. rods, valve retainers)
- Contour and polish in/ex. valve heads/replace with lighter units
- Adjust port size and finish for best gas flow
Some of the above items are in the gray area of modifying the engine rather than building the engine to strict blue print standards. I've probably left out a bunch more stuff, but that's an idea of what could be done above and beyond a "normal" rebuild.
Hope this helps,
Sherwood Lee
http://members.rennlist.org/911pcars
www.seinesystems.com