Takes a special kind of chilled out guy to go through that painstaking process with professionalism from start to finish. The gentleman there fit the bill perfectly.

That machinist is an excellent teacher and communicator. His explanation is so precise and thorough. He should be teaching in a vocational college. What a Professional. I salute him.

almost 2 mill views and only 132k subs. he really does it for use. thanks man youve thought me a lot over the years even today. thank you

I was a Sunnen salesman for 40 years. My hat is off your one of the few people that I have seen that runs the VGS20 correctly,

I love falling asleep to these technical videos... i’m not saying that they’re boring but your narration is just so soothing

Amazing video! That guy knows his stuff, but more important he is willing to tell you WHAT and WHY is he doing it. Great guy!

This is just like I’m at work. Same exact machines. Both of em. Was cool to see the quirks of someone else do this !

thanks for creating this video. I am currently enrolled in a local auto tech program and we found your site during class. you have excellent videos that translate volumes of information in a condensed and comprehensive format. your efforts are appreciated.

Jafromobile and Mark. What we can learn from others never ceases to amaze me. But, Its the people like you who take the time and show the patience to make accessing that knowledge possible. Thanks so much! I've learned a LOT in just two, well produced videos with thoughtful and articulate narration.

By far one of the best auto engine / mechanical videos Ive watched this year

Man this is awesome. I love how much pride this guy takes from doing his job so well. Makes me want to become a machinist! It's awesome that they let you watch/film their work. Great stuff.

Thanks for this quality video, learned a lot (and with your other cylinder head 101 series, too). Cheers!

This video is ridiculously valuable. Thank you for making it and sharing it with us!

Thank you so very much for this video I've been wanting to see this for so many years.. In my head I've been trying to figure out how they were able to perfectly align the machine for every brand and model of engines out there ! Thats awesome I want to quit my job and do that !

Have a whole new respect for machinists, great video.

Awesome video thank you. I've been tuning imports for 22 years and finally get to see a machinist do their magic.

Your machine shop is awesome for participating in the video. He did a great job of explaining everything he was doing. You certainly can't do that type of work without very specialized equipment. That's what machine shops and machinists are there for. You have a great relationship with you guys over there. Let him know he has my thanks next time you see him. I learned a lot and watched every second. Your machinist cares about precision performance work. Yet another awesome video.

I'm not even much of a DSM fan, but I've pretty much watched all of your videos because of how informative they are. I learn MANY new things every time you post a new vid. Thank you, and keep up the great work!

This machinist should teach tech classes. I could listen to him all day. Nice and consistent like his work.

Made me understand the definition of multi angle valve job. Thanks.

Man, the camera work, the editing, the knowledge, the delivery. Great vid.

Great video and makes me understand why good machinists charge what the charge. Uploads like this are the asset to KZfaq and hate when persons who don't have the wisdom and expertise such as yourself are of a sudden SME's and critiquing what you took the time to share what you could have kept to yourself. Thanks so much for best 29 minutes i have spent on YT in a while.

The machinist has such a calming voice. I ended up feeling hypnotized from listening to him talk.

Nice to hear people who know what they are doing explain the logic and process of their work

Your vids KICK ASS man! Seriously you are one of the best, you take the time to show and explain things, you share the little secrets and you do top quality work! Thank you very much for everything, it sure keeps me happy watching your work over and over again! Mark also seems a top bloke. He does excellent work, unlike the butchers we got over here calling theirselves "machinists".. Wish I was closer to you guys, you'd have a helping hand and Mark would sure have my work in! Thanks again Jafro!

Great video, had a bunch of engine work done in my younger years with some explanation but this is exactly what I like.

This guy. The Bob Ross of cylinder heads... lol

I like seeing the machinist take pride in his work !

I am a firm believer of "precision engineering" and "eyeballing" never goes in hand and hand.

good thing your machine is cool with you filming, where i live, some machine shops here act like what they're doing is top secret so they dont like being filmed.. thnx for the upload bro

Good video. Excellent commentary and presentation. Genius tech info. Love it.!

I Love this level of DETAIL! Truly Educational! Thanks again for these type videos!

In my heart of hearts I always wanted to work with my hands machining and building stuff. I love your videos dude. It tickles that 'what could have been' sorta feel in me. Alas, I had to be all computer oriented and do most of my stuff in the virtual confines of software....and the hardware side...pulling cables and building out network infrastructure, just isn't the same as this stuff..

That man has so much knowledge it really amazes me how much he knows!

Jafro, your videos have been instrumental in me learning engine rebuild skills. Especially related to head work. Its saved me a lot of money on my bmw engines so far 😆

Thank you for this video and thanks to the machinist who let you recon his process.

Thank you, Jafromobile, for another top quality video. The gold edition of motor-technical educating/instructional/how to DIY on KZfaq! I don't write comments on every one, and I haven't seen everyone, but I suspect all of them are good. :)

Thanks for showing the cuts on the valves, lots of great info 💪👍💯

Very informative. Helps me a ton because I'm about to start a job doing exactly this. Thanks a lot.

i love all this ill OCD machining/engine build stuff, radial cut, dome geometry and volume balance, dynamic rotational mass crank balancing and so on, felt so good

I absolutely love your videos. Greeting from Buenos Aires - Argentina

Thats a good looking valvejob, i like how the transitions are so smooth.. Thumbs up for your videos, I enjoy them, keep the camera rollin' bro.

Pretty awesome setup and a great tech hats off to your sir.

Nice machinist. Seems like a cool dude. Kudos to him for taking sone time to show the steps. Great video

Thats a good head job, time and patience brings good results, along with the extra relief angles.

Also I can't wait to see the gsx again! Keep up the good work

Damn! I never knew how much work they put into this, thought it was a simple as 1, 2, 3, Good work machine shop and good job filming and the effort to help us all :D.

That is one calm machinist

This was amazing!

watching that machine work is so satisfying

Brilliant, ive never seen valve seats cut before, that man is a true professional, he wants them spot on :-) Worth every penny mate, you know they will give excellent results :-) Love engineering videos:-)

Amazing! I watched the entire video. Well done!

love all of your videos, and has inspired me to take on alot of things myself. thanks (:

Awesome video. That machine is incredible. So precise (granted you set, check and recheck). I like the level transfer. That is a real true. Gravity doesn't lie.

Where the heck can somebody today, in 2020, learn how to do all that professionally? College? Apprenticeship? Do you have to be born into a machining family? These are serious skills here!

Great video jafro!

What great detail & info Jaffy!!

Great Job. We need a mechanics like that. All the best mate

awesome video great coverage on the complete job

I went school for this. watching videos great refresher course for me. Especially this video man you reminded of my instructor from last MA class. You make a great teacher. :)

salute to the great machinist

in my country, people that talk like him would be called singer, he does not talk he sings, good job at all

excellent vidja, great to be able to peak over the shoulder of a pro at work, Mark the machinist would be a good teacher, explaining every step along the way, thanks.

I liked this vid even before I hit the play button : ), I always learn great usefull info from all your vids

very professional job. thanks guys!

Absolutely brilliant. I loved the CV joint on top of the valve grinder to use the machine torque but not the head bearing. Using the seat itself as the rotory guide is standard I guess but I never knew.

Dear doc Jafro im a fan... you are the best. BR und salutee' from Flensburg SH in Dax Raich ... !!! Keep rollin ... u my man.

Great info!!! And thumbs up to your machinist!!!

amazing work!

Fantastic, the best one of them all.Thanx.

That Sunnen seat machine is ancient technology now, only a step above someone with a grinding rock and hand tools. The shop is taking care of it and using it properly so the work is good but could be better with some minor changes. That machine will only be as good as the care put into set-up for the cut. I would have liked to see the machinist show the process for checking taper and wear in the valve guides prior to setting the head up for making cuts as these are used guides and will have wear inside. There should be a selection of sizes to choose from for the pilot rod so you can find the tightest fit while the pilot still remains free moving in the guide. Pilot rods can be sized by the 1/10 of a thousandth when ordered. The closer that rod fits the better the end result. I only saw one rod chosen and it was forced down into the seat for the guide leveling process, something that should be avoided as you can force the guide to wedge at an angle when inserted into a less than ideal guide bore when the shoulder on the pilot meets the possible tapper at the end of the guide. This can cause the seat to be tilted in relation to the guide and that tilt will transfer to all later cuts. You should always chuck NEW or used valves into a face cutter to check for bent or out of round valves even if you do not plan on actually facing them. I can see a rounded leading edge on his seat cutter in the video, a touch-up with a green wheel would bring his cutter to life again and result in a better seat. If you notice in the video the pilot wobbles in the hole as he makes the cut to the seat because the cutter is dull and he's rubbing the profile into the seat more than he is cutting the seat. That will have a pretty finish but the job could be much better done with a correctly sharpened seat cutter. The idea here is to make the hole round and it could be much rounder if the cutter is sharp and not deflecting 1/16 an inch in every rotation of the spindle. You notice he said he was planning to lap the seats. That's not a process you need when your machine is rigid and your cutter is sharp but it's a better process than running a dull cutter on a side-loaded wobbling pilot and calling it a done deal. Granted he only lapped one set of valves to verify his seat location. Lapping valves is a step backwards towards the grinding rock as you are using grit to finish your seat which in poorly trained hands can embed the grit into the seat and valve faces and continually grind away at your seat work as the valve rotates in an operating motor. This problem can be seen on heads with lapped seats in motors that are run for a short time and are pulled apart at a later time. The seats will grind them selves wider and wider making the work put into having the sealing pressure being concentrated in as thin a seating surface as possible be a wasted effort after some running time. The embedded grit doesn't go away it gets pushed into the valve face deeper and deeper as the engine runs allowing it to continue a cutting action on the seat job. Slamming the valve into the seat while lapping will embed the grit of the compound into the valve face. I can hear and see this being done in the video, not an ideal way to do the work but in the long run it is not the end of the world. An engine is an air pump. It will work when it is worn out or perfectly machined. Hard run race engines are put together with loose tolerances for reliability yet the same engine going into a passenger car for use in commutes is put together tightly for reliability. At the end of the day any reasonable amount of effort will give you a working product and I have respect for people who do the best they can with the tools they have.

now thats a mechanic that knows how to take pride in his work good job, DSM FTW!!

I love these to keep comments and respectful for these videos

Great video and top notch workmanship-- many years ago I had a 74 Kawasaki Z-1 900 bored out to 1015 cc and I had Manley SS oversize valves that had 'reliefs' for better flow, also had the runners cleaned up and port matched, Megacycle 417 lift cams too

Wow great video !! Learnt so much

Man that old timer seems to be a jewel for information. Next time you get any work done with him be sure to tape it.

Excellent, seriously excellent. Thank you so much.

I am in the industry (Regis shop supplies) and I love watching him. It really is like watching Bob Ross paint happy little trees! I've been in a few of those wrench throwing shops.....

Awesome stuff mate super interesting

Great Video! I have to admit tho..., I feel like I might be a bit of a freak watching a video of this detail and LOVING it! Thanks again.

Awesome vídeo, excellent job, greetings.

That's awesome, thanks guys

Respect this guy!

This machinist is legit. Taking the needed time to check and recheck. Not forcing or rushing anything, I like what I see. As far as I am concerned, that part is a wrap. I love it when a plan comes together! Real good video. You usually don’t see stuff like this on crap tv videos on cable. The machine shops they use wouldn’t let you video their work! Some people just don’t get the level of repetitive tedium that is standard manual machining. It isn’t that it is hard to learn or do, but it is repetitive and it can be tedious. You have to be ok with that. Doing a stellar job despite the obstacles is what sets this guy’s work from the others and being honest too!👍🏻

You took all your work going out the door so easily.

Kept thinking "where's this 30 degree cut?" until 27:27, bingo! I see it! all makes sense!

That was great Learned a lot

Don't forget to talk about valve seat width. Intake vs. exhaust. perf. vs. stock. great videos.

awesome video!!

very good for people to see and learn thank you

I think, out of all the tuning, this point in the process making the head more efficient, gets missed by a lot of back yard car enthusiasts.Thank you Jafromobile for showing everyone what is required in getting true power and reliability from your stock head. Also, I must ask, can you heat treat the valve train assembly before getting this work done, or is it better to do it afterwards. Great videos, a true joy to watch.....

+Victor Bangle Your replies are disabled. It's not the head that was moving. The table this is on weights over 800lbs. Actions were taken to compensate for this in this very video. There's always a couple thousandths of an inch of deflection in the guide because if there wasn't, it would get stuck inside the valve guide. The reason you cut, inspect, lap, cut again, lap again and inspect is to ensure you're setting your stops correctly. If it chatters, that's bad... but the process accounts for the smaller guide variable.

I work with block heads every day for a year and I rest watching videos about it at home. Lmao kkkk best work for someone who wants to start a career with engines or engineering, you can learn a lot from these workshops.

Good job, Masters! Perfect

Dude, this is the Bob Ross of Machine Shops. Very nice video.

Nice work. On a not new engine/head, before going any valve seat cutting, check for ware in the valve guide. An oversize/worn guide will allow the valve to rattle rather than close cleanly. Use an oval go/not go gauge to check for ovality. Oh, and check for ware of the valve stem for the same reason. Also if there is any combined tolerance build up, lowering the valve in the guide by recutting will hide this but it will very soon reappear. Checking for wear should be done before machining to prevent this. Get rid of any discernible wear before starting to improve things from stock.

Great video

Great video man. Many gear heads will find this very interesting.

Love the fact that the machine shop is using a CBN plated wheel to grind the valves. The plated wheels never loose their shape!!!

Heh .. that was a quick video ;) As always, love your work and videos.