Quote:
Originally Posted by 911 Vintage Par
This was very common on the early 911 SC. There was a bad batch of springs. The issue was addressed by the factory and spring failures were greatly if not completely resolved.
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This is good to know. Before my time with Porsche engines.
I have not seen any heads or engines with a failed springs since working on these engines. However, we have seen springs broken where the spring was placed into Coil bind after the cams were changed and no change made to the set up. Cannot blame the springs for that.
We have on occasion discarded new springs that showed a odd spike in the force/lift graph.
The stock Retainers are something that do need to be checked. We have seen many that have cracked or failed completely. Be careful of the Titanium Retainers as well. Many heads that we have seem had these fitted and the underside showed serious wear, where the spring was working against the material. Common I think. Always check this.
There is not a lot that anyone can do but check.