This is a machine shop service on your cylinder heads. We are offering many optional performance packages. These include the standard 107 port package. This option includes new guides, isotropic valve springs, head ported and flow tested. Here are some flow test results. Test pressure is 28in of water. Intake stock intake ported exhaust stock exhaust ported. 100 96 118 88 100. 200 189 211 169 181. 300 255 275 177 207. 400 288 323 185 220. 500 303 355 188 247. Valve seats are CNC machine. Intake port has diamond type finish, exhaust is sand-rolled finish. In March 2017 we will have guides, oversize valves, spring kits available. We…