Porting BB heads

Nothing wrong with tapered pilots or stones for grinding seats. Since valve lapping is the last step in grinding seats and valves, the lapping assures a round, concentric seat. People have been using stones to grind seats and valves since the inception of the internal combustion engine. Sure, cutting with a tungsten carbide blade is better, because lapping is not required and it is much faster, but saying it produces a better valve seat is misleading at best, especially since you conveniently left out the finishing process of grinding, which is lapping. Also, I never grind a seat with a questionable valve guide. If the guide is worn beyond spec (in most cases over .002") then the guid is either replaced or a bronze liner installed. With the guide clearance properly restored, the valve seat will be round and in the correct position with a tapered pilot. Yup, worn stones do chatter, but that's what they make diamond dressing wheels for. Chuck the stone up in the dresser pilot, set the angle and redress the stone. Brand new face, ready to cut. I just know you're not saying a multi angle valve job cannot be done correctly with stones. Are you really implying that here? I started doing cylinder head work in 1979 at Hogan Auto Parts and Machine Shop in Macon, Georgia owned and operated by the late Snake Hogan. He was a legend around here back in the day. I learned from him the correct way with stones on a Souix Valve grinder how to do single and multi angle valve jobs. It's not rocket science and it's not secret service CIA stuff. And it can be done just as good with a stone as with a cutter. The cutter just allows for removing that last step, lapping thus speeding the process up, allowing you to turn more work. Saying a cutter is better or more accurate is in itself, inaccurate. It is faster and nothing more. I don't give a rat's butt what anybody says, I've done the work with BOTH stones and a cutter and I know the difference. If you're a dumbass and let your stones get a groove in them and don't keep them dressed properly, yup, you better believe you'll grind some crappy *** seats. Likewise, if you try to grind seats using bad valve guides to center up your pilot like an idiot, once again, your work will be less than stellar. Most stone valve jobs suck? Really? Tell that **** to Larry Shepard, Smokey Yunick, Bob Glidden, Richard Petty, Donnie Allisoon, Cale Yarburough, Fireball Roberts, Don Garlits and on and on and on. It's just not true. Properly dressed stones will do every bit the job that any multi million dollar cumputer run cutter will do as long as it is done correctly. A man knows what the hell he's doin can read a micrometer just as good as any computer can......possibly better at times.