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Registered
Join Date: Jan 2018
Posts: 878
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valve spring height questions
Hi. I have some old shims. They are cerated. Use or stick with the new ones I have purchased.
Sixty seven 911S heads Lyndon 
Last edited by Lyndon302; 06-22-2020 at 02:41 AM.. |
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06-21-2020, 11:46 PM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,467
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I would use the original shims as they are period correct for the antique value of original.
Bruce |
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06-23-2020, 10:59 AM
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Registered
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 3,301
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cerated shims
They are old school parts from NAPA with old thinking.Better check the cc,s for compression as every time there is a valve job the compression is reduced from a stock setting.I would always clean one piston & head then cc to see what you are starting with.Adding new valve seats adds an exponential cost to the rebuild.9.3 to 1 can get to 8.2 to 1 real quick with a non Porsche shop cutting the valve seats then refacing the valve to drop it even more.A resurface of the head will gain a little back but that changes the reference of the idler shaft to the tensioner extension.Aint this fun?
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06-28-2020, 04:02 PM
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