Spring height school me!

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Kevin D.

Kevin D.

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I purchased some new Comp. valve springs to match my cam.They are #986 double spring with dampner.I will be installing on edel. 60179 heads.I have no idea about spring height.Also will these springs work just replacing or will machine work need to be done.Heads have less than 300 miles.Have been ported.Your input here would be appreciated,Thanks Kevin.
 
The installed height will be set when the valve job is done. So - technically, you already have it set. As far as adjusting - you can, but you need to be able to measure what the heads have, and the pressure on the springs, and then set them up for proper pressures. You may want a local performance machine shop to take care of it for you.
 
you need a tool somewhat like this one ..that goes in place of the valve spring..

http://www.ebay.com/itm/VALVE-SPRIN...0850115602&pt=Motors_Automotive_Tools&vxp=mtr

once you determine the height ....you can adjust the spring height with shims to get to the install height as spec or adjusted it to whatever you want or need....

the valve spring manufacturer will give you a height and how many lbs it is at that height...
 
Spring height is determined by the spring manufacturer to achieve the valve closed pressure value.
That is the height ( installed height ) you want to achieve through locators / shims and how deep you cut the seat when doing the valve job.
Picking up a lot of space by sinking the valve is a bad idea.....if you have to pick up a ton of height , you need to figure out a plan B.
Excessive shimming under the valve can be done to shorten the height , but try to do it with as few pieces as possible.........an .060 shim instead of two .030's etc.
Equalize the heights , then pick a spring that will work with the height you have to work with........there are a lot of spring options that have the same rates with installed heights from 1.75 to 2.0 ".
 
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