Generation III Internal Engine 1997-2006 LS1 | LS6
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Piston to valve problems with Summit Cam

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Old May 29, 2021 | 09:51 AM
  #21  
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Originally Posted by Old Buzzard
Nope. The added length of the pr is accounted for in the lifter cup being pushed into the lifter bore by that preload dimension.
Ok. Thank you. I assumed that the lifter "pumped up" when running and would touch the piston. Sorry for so many questions guys. But thanks everyone for the help.
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Old May 1, 2023 | 04:33 PM
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Didn't see a need to start a new topic for the same cam and wanted to double check myself.

Nephew is putting this in his 04 LS1 GTO. He has 243s decked for cleanup. We removed the spring from a stock lifter, used an inner spring from an old set of double springs and set the measuring pushrod to zero lash. We measured piston to valve clearance at .133. Does that seem correct?
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Old May 1, 2023 | 06:23 PM
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Anything bigger than .090" is acceptable.

.133" is plenty
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