Generation III Internal Engine 1997-2006 LS1 | LS6
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To shim or not to shim?

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Old Nov 23, 2025 | 06:25 AM
  #21  
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The slight increase in pressure is negligible. Without figuring it all out, maybe 5 more lbs. going from 1.815 to 1.800. The real benefit is controlling the spring surge at high rpm......
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Old Nov 23, 2025 | 11:17 AM
  #22  
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Default Seat with Class

Seat pressure with ONLY a small increase (Class not full) WILL do MORE to prevent
the Valve FROM "Bounce" an Event that can "pump up" the lifter if HYD.
Lance
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Old Nov 23, 2025 | 02:35 PM
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Originally Posted by grinder11
The slight increase in pressure is negligible. Without figuring it all out, maybe 5 more lbs. going from 1.815 to 1.800. The real benefit is controlling the spring surge at high rpm......

So that’s the reason I’m doing all this , valve control I will shift at 6800 and will def be spinning 6k when I’m on the track. There several road courses within an hour of my home
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Old Nov 23, 2025 | 02:38 PM
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