Grooves cut into valve spring shims

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bbab3

bbab3

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What’s the cause of these grooves cut into the valve spring shims? They were part of the parts that came with a set of Edelbrock 60779 heads. The springs and the dampers look fine.
 
You have valve float, springs are spinning.

You need to verify installed pressure and open.

What cam and what presure do you have now,
 
The valve spring that was used has an inner dampener on it, that dampener is chewing the groove, why, see post 2,3 and 4.
 
Valve float makes sense. I thought it might be to much lift causing the damper to bind and cut the grooves. I should of mentioned that the heads are used and when I bought them I received them disassembled minus the valves, they where probably bent. The heads now have had a new set of shims, set of valves and seals. Thanks for the info.
 
bbab3 said:
Valve float makes sense. I thought it might be to much lift causing the damper to bind and cut the grooves. I should of mentioned that the heads are used and when I bought them I received them disassembled minus the valves, they where probably bent. The heads now have had a new set of shims, set of valves and seals. Thanks for the info.
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Sounds random to say they were bent.
Ive played with different double springs on a .528 purple cam WITHOUT a spring tester and just set them up to box spec to find my shims all dug into 3 months later and never bent a valve. Even the heads were slightly scarred. Bought a spring tester after that..checked my open and made sure it was enough regardless of if the seat pressure was a hair high...but if it was low , i changed springs.
 
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