BTR Truck Norris Cam, Springs and Hats 12613412 then added a single S475

then added a single S475 Borg turbo

Components in kit:

550" LIFT GEN V LT BEEHIVE VALVE SPRING SET - LIKE 12691120 - BTR91120-16

Compatible with stock and performance camshaft applications

Spring specs:

BTR Truck Norris Cam, Springs and Hats 12613412 then added a single S475BTR GEN III & IV LS TRUCK NORRIS CAM Specs: 212 22X, . 552 . 552, 107 LSA INTAKE LOBE LIFT @ TDC: 0. 05271 The Truck Norris will deliver a roundhouse kick in the pants to your 1999 2013 Silverado or Sierra. Developed from hundreds of hours of in house cam lobe design and dyno testing, this camshaft has more power and torque everywhere in the curve compared to our legendary V2 truck cams.