PAC 1518 springs on LS3 heads with XE-r lobes?
11-18-2009, 08:38 PM
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PAC 1518 springs on LS3 heads with XE-r lobes? I am thinking about using the PAC 1518 beehive springs on a set of LS3 heads with a 234/238 XE-R lobed cam. Has anyone had problems with this setup? Figure it will be ok due to the light weight intake valves but would like to hear real world experiences.
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11-19-2009, 09:19 AM
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It was recommended by several cam guys not to run the 1518's on my 92 heads even with lite weight valves (REV). The XRE cams are ground aggresive, a dual spring would be better. I found this out after buying the 1518's. The LS3 valves still have a lot of mass to control at higher rpms. What kind of lift #s does your cam have? I know Mast Motor sports run bee hives on there cams. You could do it. I would call your cam manuf. for more info.
I'm running the PAC 1521's on my FTI cam
I'm running the PAC 1521's on my FTI cam
11-19-2009, 09:28 AM
#3
I don't think there would be any problems with the 1518's on this one, so long as you check the installed heights and shim the springs up to about .050"-.060" from coil-bind! Even though the intake valve is "light weight", it's still fairly large and relatively heavy, so you'll want to do it right!
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11-19-2009, 01:59 PM
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11-19-2009, 06:51 PM
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It was recommended by several cam guys not to run the 1518's on my 92 heads even with lite weight valves (REV). The XRE cams are ground aggresive, a dual spring would be better. I found this out after buying the 1518's. The LS3 valves still have a lot of mass to control at higher rpms. What kind of lift #s does your cam have? I know Mast Motor sports run bee hives on there cams. You could do it. I would call your cam manuf. for more info.
I'm running the PAC 1521's on my FTI cam
I'm running the PAC 1521's on my FTI cam
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11-20-2009, 02:10 PM
#8
I've tested the pac single on our LS3 engine dyno motor with 620" lift up to 7100rpm using lobes similar to a LSL.
That being said the new PRC valve spring kit is very affordable & uses a spring that's several steps above the platinum/xtreme springs.
For well under $300 you get a complete spring kit with springs, seats seals, and retainers built in the US so you know the install heights will be spot on.....
That being said the new PRC valve spring kit is very affordable & uses a spring that's several steps above the platinum/xtreme springs.
For well under $300 you get a complete spring kit with springs, seats seals, and retainers built in the US so you know the install heights will be spot on.....
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Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
11-20-2009, 02:15 PM
#9
It was recommended by several cam guys not to run the 1518's on my 92 heads even with lite weight valves (REV). The XRE cams are ground aggresive, a dual spring would be better. I found this out after buying the 1518's. The LS3 valves still have a lot of mass to control at higher rpms. What kind of lift #s does your cam have? I know Mast Motor sports run bee hives on there cams. You could do it. I would call your cam manuf. for more info.
I'm running the PAC 1521's on my FTI cam
I'm running the PAC 1521's on my FTI cam
