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I Need Valve Spring Suggestions

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Old 04-28-2010, 03:10 PM
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Originally Posted by GMCtrk
I run 1218s with the same cam, they're fine. These springs have the same specs as comp 918s as far as pressures and such and that's what matters more so than max lift ratings. Coil bind isn't until .660". 1218s or 1518s works great. I spin to 6800 daily.
Why'd you run the 1218s instead of the 1518s?
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Old 04-28-2010, 05:55 PM
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Originally Posted by 454navyss
i have heard from several reputable engine builders in DFW that the dual springs tend to bind and break or bend pushrods as well as put way too much added stress on the rocker arms. i dont know first hand, thats just what i have been told
Ive seen that happen several times when not installed right.
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Old 04-28-2010, 05:56 PM
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I have the $200 Lunati .660 springs..
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Old 04-29-2010, 09:08 AM
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Originally Posted by GMCtrk
I run 1218s with the same cam, they're fine. These springs have the same specs as comp 918s as far as pressures and such and that's what matters more so than max lift ratings. Coil bind isn't until .660". 1218s or 1518s works great. I spin to 6800 daily.
Originally Posted by DV2000NJ
Why'd you run the 1218s instead of the 1518s?
I'm not trying to answer for the guy, but if we assume he measured installed height and coil bind, and they both came out exactly to what PAC advertises (1.800" and 1.140" respectively) and if he decided to keep an added .050" clearance to be safe, we can see that he has .010" to spare (1.800-1.140-.600-.050").

It's cutting it close, but if he already had the springs I can see why he's running them.
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Old 04-29-2010, 12:17 PM
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I have a gauge for that
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Good info here guys. Any comments on the spring base issue?
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Old 04-29-2010, 12:37 PM
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I believe it just depends on which style of valve seal you are using. Seal & shim as one piece, or the seperated style. I run Crane dual springs. With your plans, I recommend dual springs for your setup also.
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Old 04-29-2010, 02:23 PM
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Originally Posted by Atomic
Good info here guys. Any comments on the spring base issue?
The 317 heads use the same valves (minus the sodium filled ones) as the LS6, which I believe are 2.00 I and 1.55" E. So I would say any spring meant to fit the LS6 (243 casting) will fit your 317 heads. I've tried finding the spring pocket diameter on the 243s and I can't find it. Perhaps someone else can chime in, cause I'd like to know this as well considering I have them on my truck.

The LS1 (241 casting) heads have a 1.63" dia spring pocket however, I managed to find that one.
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Old 04-29-2010, 02:49 PM
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I have a gauge for that
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I see 0.505" and 0.565" offered for most springs, what is this referring to? The diameter of the valve stems being used?
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Old 04-29-2010, 02:54 PM
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Really? where are you seeing this listed, because I only see OD and ID listed for these springs and even ID are much bigger than either .505 and .565"
http://www.pacracing.com/Beehive_Spr...Set_of_16.html

http://www.pacracing.com/Street_Stri...Set_of_16.html

http://www.compperformancegroupstore...Category_Code=

It's possible those smaller diameters are the measurements of the top coil of the beehives?
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Old 04-29-2010, 02:56 PM
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I have a gauge for that
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For instance the pat golds, http://www.jegs.com/p/Patriot-Perfor...22045/10002/-1

There are 2 different sets for the different spring base sizes.
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