BTR Twin Turbo Stage 1 Cam Specs: 222/231 .602"/.598" 112+4 Originally developed for a 5.3/Hi-ram/Twin 366 combination, the stage 1 Twin Turbo cam has proven to be a versatile camshaft that can do extremely well in multiple applications. Good for 5.3's and 6.0's with cathedral heads and big intakes, it also gives great results in LS3 headed applications as well. The stage 1 Twin Turbo cam has proven to be a versatile camshaft that can do extremely well in multiple applications