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Old 04-24-2018, 07:23 PM   #1
caper

 
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how to tell stock valve springs from aftermarket

is there any way to identify stock valve springs from an aftermarket set?
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Old 04-25-2018, 12:34 AM   #2
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Best thing to do is take a spring to an engine builder and have it checked out, he will measure the P.S.I. both seat pressure and open, takes a few seconds.
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Old 04-25-2018, 12:50 AM   #3
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Quote:
Originally Posted by Quicksilver2SS View Post
Best thing to do is take a spring to an engine builder and have it checked out, he will measure the P.S.I. both seat pressure and open, takes a few seconds.
well it'll be at a engine builder, that's the issue...so what are the stock spring measurements for those?
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Old 04-25-2018, 08:33 AM   #4
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stock springs are blue or yellow so it should be easy to tell what is stock vs aftermarket

ls3 spring specs:

From the GMPP catalog

12586484
Valve Springs (not shown)
• Beehive style springs • Standard LS6/LS3 springs
• Use cap P/N 10166344 • 1.250" @ 295 lbs. pressure
• 1.800" installed height • Max lift .570"
@ 90 lbs. pressure
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Old 04-25-2018, 10:47 AM   #5
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So just looking at them the stock springs are blue or yellow? The whole spring? You're sure?
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Old 04-25-2018, 11:02 AM   #6
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Quote:
Originally Posted by caper View Post
So just looking at them the stock springs are blue or yellow? The whole spring? You're sure?
well they are when new, but you should see some sort of coating/paint on the springs. i'm positive they are blue or yellow as i have removed yellow springs from my engine and replaced them with blue springs

there is no difference between the yellow or blue springs aside from the color of the coating/paint

google it if you are still unsure
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Old 04-26-2018, 10:26 PM   #7
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Quote:
Originally Posted by Quicksilver2SS View Post
Best thing to do is take a spring to an engine builder and have it checked out, he will measure the P.S.I. both seat pressure and open, takes a few seconds.
+1 This and whatever color the valve spring is.
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Old 04-26-2018, 11:45 PM   #8
hammdo
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These are the stock bee-hive springs (not dual springs):



New they may have been blue or yellow but, not with miles ;o)

Aftermarket depends on brand. These are BTR dual spring .660 with titanium retainers:





GMPP (Chevy):



Bee-hive next to a dual spring:



Some aftermarket springs can be a bee-hive design, thus it depends...

Hope that helps...

-Don
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