cc503 installed height spec
cc503 installed height spec Hey everyone, getting ready to do a top end swap, i bought a used cc503 off a member here and don't have the cam card, i can't seem to find the valve spring installed height spec on the CC site. anyone know/have this info?
Thanks!
Thanks!
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From: Nebraska
My CC503 recomends 1.800" installed height. That's with using Comp 918 Springs.
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Joined: Jun 2013
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From: Kernersville, NC
Back when I was doing my CC503, I got PAC1518 springs on a group purchase.
As best I can recall, I think the install height recommended was 1.75 with the retainers and locks I was using.
When I measured, most of them were 1.78....I left them at 1.78.
We will need someone with more experience than me to chime in on this as I know just enough to be dangerous on this topic....
Edit: Looks like 93M6 beat me to it. =)
As best I can recall, I think the install height recommended was 1.75 with the retainers and locks I was using.
When I measured, most of them were 1.78....I left them at 1.78.
We will need someone with more experience than me to chime in on this as I know just enough to be dangerous on this topic....
Edit: Looks like 93M6 beat me to it. =)
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cam card will show what spring it recommends. Likely the 918. That spring spec for its published seat & open specks is 1.800" installed height. Setting up a 1.800" speck spring a little shorter will increase the springs open & seat pressure. setting them up at 1.780 for example, IMHO, would not be a problem. More important to set all the springs the same height
^^^^^ This.
cam card will show what spring it recommends. Likely the 918. That spring spec for its published seat & open specks is 1.800" installed height. Setting up a 1.800" speck spring a little shorter will increase the springs open & seat pressure. setting them up at 1.780 for example, IMHO, would not be a problem. More important to set all the springs the same height
cam card will show what spring it recommends. Likely the 918. That spring spec for its published seat & open specks is 1.800" installed height. Setting up a 1.800" speck spring a little shorter will increase the springs open & seat pressure. setting them up at 1.780 for example, IMHO, would not be a problem. More important to set all the springs the same height
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the spring height tool does not measure the spring by itself, it measures the distance from the top of the locator to bottom of retainer. You want that measurement to = whatever the springs speck installed height is.
get a spring with a installed height to = your stock springs (1.750-1.780 in height
many aftermarket springs are speck for 1.800" height which would require the spring pockets to be machined down to get that height. If you install a 1.800 spring a little shorter than its closed and open seat pressure is higher by "X".
Crane 10308-1 kit is a stock height spring and Alex Springs also offers a drop in kit for the LT1 AL head, do a search for part #
you will need new valve stem seals and it is a good idea to buy a pack of shims. They come in various thickness and you use them under the spring locator to raise it so your installed height is 1.750 or 1.780 whatever the installed height speck of the spring you get
use a spring height measure tool to confirm installed height. Maybe all your springs will wind up not needing shims, some may, all may.
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Verdad Gallardo when you pull the stock springs off you may find shims under some, all or none of the springs. IMHO I would use a valve spring height measure tool and install shims under the spring locator as needed
the spring height tool does not measure the spring by itself, it measures the distance from the top of the locator to bottom of retainer. You want that measurement to = whatever the springs speck installed height is.
get a spring with a installed height to = your stock springs (1.750-1.780 in height
many aftermarket springs are speck for 1.800" height which would require the spring pockets to be machined down to get that height. If you install a 1.800 spring a little shorter than its closed and open seat pressure is higher by "X".
Crane 10308-1 kit is a stock height spring and Alex Springs also offers a drop in kit for the LT1 AL head, do a search for part #
you will need new valve stem seals and it is a good idea to buy a pack of shims. They come in various thickness and you use them under the spring locator to raise it so your installed height is 1.750 or 1.780 whatever the installed height speck of the spring you get
use a spring height measure tool to confirm installed height. Maybe all your springs will wind up not needing shims, some may, all may.
the spring height tool does not measure the spring by itself, it measures the distance from the top of the locator to bottom of retainer. You want that measurement to = whatever the springs speck installed height is.
get a spring with a installed height to = your stock springs (1.750-1.780 in height
many aftermarket springs are speck for 1.800" height which would require the spring pockets to be machined down to get that height. If you install a 1.800 spring a little shorter than its closed and open seat pressure is higher by "X".
Crane 10308-1 kit is a stock height spring and Alex Springs also offers a drop in kit for the LT1 AL head, do a search for part #
you will need new valve stem seals and it is a good idea to buy a pack of shims. They come in various thickness and you use them under the spring locator to raise it so your installed height is 1.750 or 1.780 whatever the installed height speck of the spring you get
use a spring height measure tool to confirm installed height. Maybe all your springs will wind up not needing shims, some may, all may.
I'm just curious how with brand new springs and untouched heads, how some might need shims while others don't?
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The Alex springs set at 1.780 will give you the published spring rate for that spring installed at that height which I would think is way good for the 503 cam
