New Magnum heads for 347 with Flow data
At this point it's probably a good idea to give the port a little more area around the guide boss. Here is what it looked like after about 10 mins of fast carbide work. J.Rob
.1 64
.2 130
.3 189
.4 217
.45 214
.5 212
.6 212
Forgot to add: port volume is 160cc's now.