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A big thing to note is that the stock Valvetrain is realistically at it limits at 6600 rpm's. Once you upgrade the valve springs then the limit is still there for the Hydraulic Roller Lifters. You can spin them up to 7000 rpm's but realistically wont see much more then 6800 because it will start to float.
I have spoken with a few big names in the LSX engines and a 4" bore short stroke engine would be a perfect high RPM engine. If you use a Solid Roller Cam and Lifters and a Rev Kit then the rpm would last out to about 8000-8500 rpm's.
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'07 TrailBlazer SS 370/L92 "TVS2300" MagnaCharger 20 psi
Authorized MagnaCharger Dealer/Distributor
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