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Which valve springs for boost? Playing it safe

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Old May 25, 2009 | 05:41 PM
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Default Which valve springs for boost? Playing it safe
My cam is 218/224 @ .050 .561 lift. Was going to run LS6 springs, but on second thought would like some extra insurance against valve float. Have L92 heads, planning on running around 10lbs of boost. Not planning on spinning the motor to high, probably 6k rpm. What springs you mild cammed boosted guys running?
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Old May 25, 2009 | 11:58 PM
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Originally Posted by LQ9CHEVELLE
My cam is 218/224 @ .050 .561 lift. Was going to run LS6 springs, but on second thought would like some extra insurance against valve float. Have L92 heads, planning on running around 10lbs of boost. Not planning on spinning the motor to high, probably 6k rpm. What springs you mild cammed boosted guys running?
I'm running patriot gold springs, shimmed to 1.750", ran them for 20k miles this way. Small turbos with lot of backpressure. work fine.
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Old May 26, 2009 | 12:49 PM
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Originally Posted by Fraser@SpeedInc
I'm running patriot gold springs, shimmed to 1.750", ran them for 20k miles this way. Small turbos with lot of backpressure. work fine.
Great springs. I bought mine from speed inc, but I didn't shim them

car still ran great until I tore it down for a 370, th400 and front mount
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Old May 26, 2009 | 01:05 PM
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if you need 1 particular shim I can sell them that way, a .030" shim should work for most applications, just need to confirm the installed height.
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Old May 26, 2009 | 05:49 PM
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Originally Posted by Fraser@SpeedInc
if you need 1 particular shim I can sell them that way, a .030" shim should work for most applications, just need to confirm the installed height.
I haven't even installed them... I'm still pulling parts off of the old LS1. I also ordered the 370 in my sig from speedinc. I spoke with you mainly
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Old May 26, 2009 | 06:29 PM
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Originally Posted by 99Z28LS1
I haven't even installed them... I'm still pulling parts off of the old LS1. I also ordered the 370 in my sig from speedinc. I spoke with you mainly
Alan

PM me your cam specs, and I can work out a valve spring installed height that can work for you. We also carry vavle spring mic if you need one?
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Old May 26, 2009 | 07:02 PM
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i'm running the yellow springs 10 psi boost and no issues to 6500 rpm. pac racing 1218's would work good too.
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Old May 26, 2009 | 07:46 PM
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What size cam are you running?
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Old May 26, 2009 | 09:05 PM
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I am running .544" lift. I don't know if the yellow springs can go .561"
The pac 1218 springs are good for .600 lift if you need more do the 1518's they are good to .650"
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