Lingenfelter C6 ZR1 LS9 2.35 11 Rib 10 Bolt Pulley

C6 ZR1 LS9 2.60 11 Rib 10 Bolt Pulley for use with to be used with ZR1 Supercharger snout or supercharger front cover. 10 Bolt Supercharger Pulley Choices – stock balancer 2.60 inch - 19% OD - 18,300 RPM supercharger speed* 2.35 inch - 32% OD - 20,300 RPM supercharger speed* 10 Bolt Supercharger Pulley Choices – overdrive balancer 2.60 inch - 36% OD - 20,800 RPM supercharger speed* 2.35 inch - 50% OD - 23,000 RPM supercharger speed* *Measured at 6,500 RPM engine speed / Stock supercharger speed 15,400 RPM Supercharger Pulley: Belt Description: Part number/ belt / idler: 2.60 diameter Stock belt 100 mm idler L250130309 2.35 diameter 82.5 inch 11 rib belt 76 mm idler   L250120309 With Lingenfelter 14% Overdrive Harmonic Balancer Supercharger Pulley Belt Description Part number/ belt / idler 2.60 diameter 2160 mm 11 rib belt 11PK2160 / 90 mm 2.35 diameter Stock belt 76 mm idler   L250120309 Factory belt specs 2137 mm 11 rib belt 12627521 / 90 mm idler Pulley diameters are measured with a 2.5 mm check ball. If measuring the pulley diameter directly with a caliper the diameters will be closer to 2.60” and 2.35”. The 2.38” pulley when combined with our 14% overdrive damper will result in a supercharger speed 23,000 RPM at 6,500 RPM engine speed. Based on LPE testing we do not recommend exceeding 23,000 RPM on the LS9 supercharger. Modifications listed on this page will requires recalibration of the factory ECM.