Brian Tooley Racing BTR 35166124 400+ CI Nitrous Camshaft for GM LS w/ Cathedral Port Heads400 CI+ NITROUS 35166124 Specs: 251 266 . 62X . 595 112+4 This camshaft is the result of years of back to back testing on 400+ cubic inch engines, mostly using TFS cathedral port heads and a Mast intake. The intake lobe made 15 rwhp more than the same exact duration Comp LSL intake lobe, and also made as much power as a Comp intake lobe with around . 680 lift. It made more power in back to back testing compared to a similarly specd cam from another