For all 911 and 930
 
Significant reduction in valve train mass reduces chance of valve float
Ultra light weight for high RPM operation
Made with aerospace quality 6AL4V alloy Titanium
Precision machined for optimum load distribution and incredible strength
For 9mm valve stem and spring part #901 105 901 50 HP.  Can be machined to fit other various dual springs as well
Complete Set of 12