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what diameter valve spring shims??

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Old Nov 27, 2010 | 10:23 PM
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Default what diameter valve spring shims??

OK guys, what diameter valve spring shims do we use? The spring OD is 1.290, but they dont make a 1.290 OD shim. So I would assume we use the 1.250 shims, but just wanted to post up here to make sure.
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Old Nov 27, 2010 | 10:26 PM
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Stock spring or double spring? I just bought some from some store called Alex's parts on ebay. He list them as stated for LS1 engines.
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Old Nov 27, 2010 | 10:39 PM
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PAC 1518 beehive springs
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Old Nov 27, 2010 | 10:42 PM
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and his are 1.255 OD, so 1.25 OD will work just fine. And they come in .030, I need a bigger variety then that, as I doubt that just .030 thick shims will get me to where I need to be. Im shimming them .030-.040 from coil bind. I dont have the heads back yet to know forsure what thickness of shims I need, so i was going to order the pack that comes with .015, .030 and .060 shims from summit.
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Old Nov 27, 2010 | 11:30 PM
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I have the exact springs and i was wondering the same thing. Hopefully someone will answer for us.
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Old Nov 28, 2010 | 07:44 AM
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Comp makes them in 0.015", 0.030" and 0.060" as 16 part kits or you can guy all thickness' as a kit.
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Old Nov 28, 2010 | 10:31 AM
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vette nuts, I know that. If you read up there, I posted that was what I was going to do. What i am asking is, WHICH DIAMETER? I am assuming the 1.250 will work fine.
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Old Nov 28, 2010 | 10:39 AM
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I still think you need the bigger diameter so the spring will actually sit on the shims not around them. But im not sure if the next size up (1.33 I think?) will fit in the cup?
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Old Nov 28, 2010 | 10:55 AM
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i only found 1.25, 1.437 (I think) and 1.50
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Old Nov 28, 2010 | 01:38 PM
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Anything larger then 1.250" will not fit into the pocket machined into the head. I have used these on several heads, including stock 241's. Here is their old catalog.

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Old Nov 28, 2010 | 02:05 PM
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perfect! Thanks man!!
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Old Nov 28, 2010 | 03:25 PM
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Just for background, even though the spring is 1.29" you have to subtract the thickness of the wire (approximate) because the wire is round. So you don't need a shim the exact diameter of the spring itself. Hope that makes sense.
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Old Feb 16, 2011 | 08:11 PM
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How are these springs holding up? I was thinking about getting a set.

when I bought my car the owner said he had $1800 in the head.. stage2 port and polish (LE) and springs..should I assume that he used good springs? or install these..I will be putting in a Lunati 60122 in a couple weeks
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Old Feb 26, 2011 | 11:26 AM
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You need 1.250" OD shims. The springs should not sit on the shims themselves either, they should be on a seat/cup. The shims go underneath the seat.
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Old Feb 26, 2011 | 02:37 PM
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Originally Posted by TurboBuick6
You need 1.250" OD shims. The springs should not sit on the shims themselves either, they should be on a seat/cup. The shims go underneath the seat.
Unless you have the one piece GM seat/seal, then they go on top of the seat/seal. The shims from Comp are also hardened.
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