Do a real high tolerance 3 angle valve job at home that rivals any ultra expensive machine shop for less than the cost they would charge, plus you get tools that last a lifetime and you can do as many jobs as you want. Neway is US made and has been around since 1952. They have cutters for any size valves. Some professionals use Neway but most have given this style of cutter up because it takes too long. Not a problem for an enthusiast!

Follow the cutting method with a simple dykem and very light duty valve lap to verify you valve contact area and seat width. This is the most accurate and highest tolerance method in the world, and the only reason your machine shop says it's "not necessary" is that they can't figure out a way to make money off the labor and skill it takes to do it right. They invest tens of thousands in special machines that can cut everything really fast and pass all the cost on to you. Prices in my area are so ridiculously high I just can't justify letting them do it anymore. You got the time and care about the job, you can do it better than the shops can with this method.

Another cool thing about this method is the mobility of it you can go to a friends over the weekend and do a valve job in his garage. You can do it in a hotel room the night before a race when you just burnt a valve on the track qualifying the day before (I actually did this on a friend's vintage Norton racer). Why more car guys don't know about this and don't do it more often is really a mystery to me.

The head in the video is a Lotus 907 high compression engine with 104 cams, basically a road racing spec. It's an expensive setup and gets a little over 200hp from 2.0 liters, this is the same engine used on the Lotus Esprit's. This method proves you can do this with high dollar high performance stuff, I have used it on Porsche, Ferrari, and other Lotus engines over the years.

If you don;t know anything about valve work or engine building then you need to read or watch some videos about the subject. There are many other tolerances and issues you need to address beyond what this video shows including installed valve height, valve spring tension, valve guide tolerances, overall valve length, and general valve and valve seat geometry theory.

Neway tools are available from several resellers including WOODWARD EQUIPMENT CHS, that's where I get my tools. Another company repping Neway is called Goodson. These tools are lifetime investment grade tools.

DO NOT BUY the Chinese and Indian kits on Amazon and Ebay. They are AWFUL. I tried many of them over the years and they all were junk. Don't be fooled into it by the low price. The Neways are expensive and they work and last a dual angle cutter is about $120 and a single angle is around $75. Well worth the cost and each cutter usually has a 5,, range so you can use them for all kinds of applications. Neway also has kits for specific jobs.