here is what I have found in 2 sets of ls3 heads with the same spring retainer and keeper set up. 153 400 open spring Correct installed height

8 valves in 1 set with 600 miles on them never reved over 6000 and only about a dozen times

1 in my set of heads with 30-40 miles and 6500 1 pass a couple times on the street

Stock valves stock rockers geometry is good

 

Exhaust valves????

 

Yes. Exh

 

Are you refering to the hardened waffer on the tip of the valve? The pics are a bit blurry. They are manufactured that way. We have some new valves that look the same way.


Richard