From: thoward131@aol.com (THoward131)

Dennis this has come from Tom Wilsons How to rebuild your VW

CRANKCASE SPECS
1600
Main bearing bore

#1 - #3        2.5590-2.5598  (in) 
#4               1.9685-1.9696  (in) 

Flywheel Oil-Seal Bore
                   3.5433-3.5453 (in)

Camshaft Bearing bore
                    1.082-1.083  (in)

Lifter Bore  
                    0.7480-0.7485  (in)

Oil-Pump Bore
                   2.7559-2.7570  (in)

These are all New Case specs

Best Regards and good luck on your project.
                    
                                                               Tom