No, My flow bench was sold in the package with all my auto machine shop equipment when I retired. However one must remember that the flow bench only measures flow, it doesn't do the porting. After almost 15+ years using it you get to understand what does and doesn't work. At first when you start using it it is painful as what appears pretty does not always flow well. Not much happens on the floor and playing with that can kill flow because the air doesn't make the turn on the short side or port floor side and runs into the air from the top or roof side setting up turbulence. Once turbulence starts flow drops like a rock. Most of the ponies in the head other then that are hiding in the valve bowl. The straighter it is under the bowl and the deeper it is straight the more the port flows till max size is reached. Valve window in sq inches should match to some degree port area. I usually make paper patterns of valve window (lift and seat circumference) and compare them to the port  but not at the flange where it is often on an angle which is irrelevant but up in the port where the actual size can be measured.  Then I compare the two in sq inches. Valve guide bosses in some heads are a horrible obstruction. The slant six heads are really bad there as are the poly 313/318 heads. Worst I have ever seen are the stge 6 mopar aluminum heads.  

I made a special tool for them (stge6) to reduce the valve guide boss to valve guide Od . I used to rework the bosses in the slant six heads but now I just bore the guides out for SBI cast iron replacements and grind the boss right out of the port . Then I tool the replacement guide insert in the lathe tapering the end so it just reaches the original stock height or nearly so but is so much less of an obstruction it is unbelievable. I cool it lube it and insert it from the spring side driving it to its proper location.  Working on the premiss that a straight round pipe would have the best flow I do everything to come closer to that as possible. Over the last 40 Plus years doing cylinder heads I have had the oppourtunity to look inside a few really good ones both from the performance industry and exotic engines like Lotus Jag etc etc. I discovered the principles are universal. deep straight valve bowl with a slight but not excessive taper to the valve seat and high port roof. In the absence of a flow bench a string going down the valve guide and out the port blown by the air from you porting grinders fan will give you a pretty good idea if the port is turbulent or not. On this head I was able to blow the string almost 2 feet out straight and it stayed realatively stable with only a slight slow yaw using the fan from my rotozip which is my porting tool of choice blowing gently into the port. The stock unmodified port wasn't even close. There is also a large discrepancy between flow benches even same model same manufacturer. trick is to do all flow bench testing on the same singe bench so you know baseline and gains (or losses) I went a step further doing them all if possible after dusk in cool similar air . A bad or turbulent port can really make a howl while a good smooth flowing port is spookily quiet. Not all companies selling ported heads do any testing I once had a set of MP Direct connection heads given to me. I tested them against stockers and pretty as the were they flowed only 67% of what stocker flowed. What did I do with them? I sold them to a competitor who knew I was an idiot and enjoyed showing him my taillights till he figured out I might actually have told him the truth. These heads were ported by a famous head shop (B&B are their initials) Sometimes in porting knowing what NOT to do is the biggest secret. I must say though by far the biggest advantage of using a flow bench was establishing max lift for the camshaft using the flow figures. There are many ways to measure flow. You can buy or build a real flow bench or a leaf blower with an manometer and a proper bore sized tube will show you improvements easily .As flow goes up vacuum or neg pressure drops. If you establish a baseline reference point it will get the job done despite the fact you wont have figures you can see if you are improving or not.

Recently I have been thinking of a simple mechanical flow bench and if I get bored may make it just for fun to see how practical it is. Once while in Germany I had occasion to have an engine discussion with a formula one engine design engineer for one of the big Germany companies.  He was surprised to hear about flow benches which surprised me. My wife accidently recorded the whole conversation as she was filming the passing scenery while the discussion was going on. He also much to my shock had a copy of my book he said in his office. I didn't know what he did when I met him but he told me near the end of our conversation that is on the video tape she made. He is now married to a distant cousin there and I may get to see him again next month. Back then he was just "the boyfriend" Still flow benches are nice and a great teaching tool however not everyone learns. Some folks don't change what or how they do it even when the figures tell them different. I remember for me it was a heartbreaking experience when I started using my bench. The relearning curve was steep, cruel  and unforgiving.  While  great tool if used right it is obvious that good results can also be had without them. BTW Warren Johnson warned once in one of his National Dragster tech articles about racing flow benches instead of looking for gains.  

don