[polizei]

After having the top end of my 3.2L Carrera rebuilt with used 3.3L Mahle cylinders and pistons, the leak down numbers are coming back OK but the compression numbers are really low (average 80 PSI per cylinder). Cylinders were re-ringed. Heads received a valve job and were twin plugged. Moved to 964/993 twin plug dizzy and added an Andial splitter. What do you suspect the problem(s) could be?

The compression test was performed multiple times by a pro and yielded the same results. Thanks for your help!