[Brotok]

Thanks for the replies. I replaced the cams with a set of stock used SC cams, replaced a few rockers too with used ones - does that require break-in?

I made a typo in the original post (now corrected): Porsche recommends re-adjusting the valve clearance after 30 minutes, not the timing - my apologies. This is in a short paragraph on page E79 of the workshop manual, and pretty much states what I have reproduced here.

I didn't really do a 30 minute ring break in like most recommend, I just went out for a ride about town where I did accelerate and decelerate a bit since I heard that that's what is advised. Have been keeping the car below 4,500 rpm. occasionally let it go to 5,000 rpm.

The reason I am not getting the book is neither money nor impatience and I have given plenty of support to our host through purchases. Rather, this car is currently my only transport and I will have to start driving it on Monday.

There is some logic behind ignoring Porsche's recommendation to re-adjust valves after 30 minutes of running the engine, and I doubt that this would be the first time that Porsche's recommendation is controversial. The logic follows:

- It is dangerous to run valves that are too tight, e.g., tighter than 0.1mm
- It is not dangerous/harmful to run valves a bit too loose, e.g., slightly less than 0.25mm (actually, 0.25 is the clearance used on many BMWs for normal operation).
- Valves only get tighter as they pound into the seat after a valve job.
- By adjusting valves to 0.1mm before they have had a full opportunity to sit, there is a risk that the valves will continue to sit after adjustment and become to tight, hence, harmful.
- By postponing the adjustment to 0.1mm we are reducing the risk of running on overly tight valves and not harming anything in the process since slightly loose valves are not dangerous.
- So, to me it just makes common sense to let the valves pound longer than Porsche recommends before adjusting them.

Does anyone agree?

Thank you for bringing all of this up