Got a 603 head from pull a part. Removed injectors, valves, heat shields, PCc lock screws. Manual says drive out PCc. Tried with Aluminum drift. Moved about 1/8 inch then stopped. Soaking in penatrating oil. Is there an easier way? Do these usually come out this hard?

They usually require the puller.

It's a slide hammer that puts a massive, instantaneous force on the PC. Even with the slide hammer, 20 blows are not uncommon.

Thanks! Make my own tools. Have a puller. What size are the threads in the PCc?

Your list of removed parts doesn't include glow plugs. Can we assume those are out?

Sixto
93 300SD 3.0

yes, glowplugs out

22х1mm
300 5cyl. homemade prechamber puller
http://image.www.rakuten.co.jp/trycycle/img1020796486.jpeg
Shimano TL-FC 10
http://www.w124performance.com/images/tools/prechamber/prechamber_removal.pdf