QUOTE(McMark @ Jul 25 2017, 01:36 PM)
All the Type 4 rockers are the same, except the size of the adjuster screw. Early cars came with 8mm adjusters, and later cars came with 10mm adjusters. Just measure yours to know what you have.
The 8mm adjusters can be modified to accept the 911 'swivel' adjusters. These decrease the side loading on the valve stems for longer valve guide life. But they're a bit of a pain to set up correctly. There are some aspects of the swivel install/mod that I don't really like -- specifically it ends up decreasing the amount of thread engagement. They definitely have a benefit, I just don't know if the headache is really worth it in the long run.
You made life easier for me. Thanks!
I've been intrigued by the pedestal foot upgrade but would need to be convinced it would significantly improve engine life to make it worthwhile. It sounds like that is iffy. So it comes down to whether to leave the 10mm adjuster screw rockers on, or go back to the original 8mm. Seems like if they were changed to the larger adjusters later, there was a reason. And maybe that tech tip was not a bad idea after all. Should I stick with the 10mm rocker set? Either way, I plan to replace the adjuster screws with new.