As many know, I decided to ditch the Mahle RS p&c's due to material issues around the head stud failures and my desire for a more scientific solution.
Moving forward with iron cylinders. These came in a few weeks ago. Qsc look fine and measure dimensionally as a very near match externally within .006mm on my caliper for critical dimensions. The jugs have the bore confirmed as true at my local engine machine shop as well as double checking the height to ensure they all truly match.
The pistons appear to be a replica cis which means aftermarket cams with additional lift will be a problem unless you want to machine the valve reliefs. I have new webcam GE40 cams with high lift so I have ordered JE pistons.
Mahle RS and qsc side by side:
Qsc 92mm 9.5:1 911 piston:
