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This vacuum operated system allows air to bypass the supercharger and the rotors to “free-spin" under light engine loads
Sleeving expands for easy installation and then tightens around its contents
The Ls3-l99 engine does not come with a keyway It is crucial that this pinning procedure be done during a supercharger install on an LS engine
35" 13psi with factory ZL1 Harmonic Balancer
Stock-Medium idle quality
CNC PORTED LS3 L99 LSA LS9 CYLINDER HEAD x 1 zl1 This vacuum operated system allowsCNC ported GM LS3 aluminum cylinder heads can be used on 2008 2012 production 6. 2L based Chevrolet Corvettes and various 2007 2012 L92 L76 6. 2L and 6. 0L based GM trucks. LS3 LSA cylinder heads are precision CNC machined on a 5 axis CNC machine to ensure that tight tolerances are maintained. The CNC porting procedure is a computer controlled machining operation that duplicates details from a hand ported cylinder head. The port and chambers are
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