I love those cut away heads. It shows so much more than just looking at a hole. Great video!

man I can't get enough of this il never be a machinist but being a hot rodder it's brain food

Hi Mark, thanks for the detail and spending the time to cut a head apart and showing us the intricacy that is needed for a project.

Makes sense. I use to run a flow bench for motorcycle heads. Mostly motocross. People always want bigger but bigger doesn’t always help.

Thanks for having an awesome channel!

I really want to thank you for sharing your knowledge and helping others. I've learned a lot of important information from this series.

Porting for years. Still learning some thing new every day ,great video thank you for your time

Great video, Thanks for sharing. Those cut aways ROCK !!!!!!!!

Great video I can tell this man has been working heads for a long time. There is a lot to learn from the old school. That said, can somebody get this man a laser pointer? We have moved past broomstick technology.

Thanks a million mark, really appreciated, top notch... 👌

Greetings from Australia,Great insight Mark, thank you. Very few engine builders would share 'secrets' as you do. You're impressive on all fronts. I'm Currently building 496 with full CNC AFR heads 300CC ,with 260@50 solid roller.

Good vid. Well spoken, clear and spot on knowledge. Cheers.

man thanks for this! I've had so many questions and ideals about port polishing

Thanks Mark. This is knowledge that only comes with years of R&D work. Thanks for sharing your knowledge with us. The porting takes a special hand and eye to get it right. Can’t wait to see the port work!!!

Great video series. I'm an old guy. And still remember that at one time a 3 angle valve job. Was the height of what we knew about head flow. Me personally. I'm shooting for efficiency. Since smog big block Ford's. Have a major hump to deal with.

This is gold! Thanks for sharing your knowledge.

It’s time to grind. Thank you for the videos. You do a great job. I e hand ported a lot of sbc, but no bbc. My last set was a pair of darts. I had Todd Goodwin CNC port those. I’m going back old school again, so this is fantastic.

Great Video Buddy 🙏 I Appreciate Your Time And Info

Thanks for your video. Im going to try to open my 460 e7 heads.

How do you go about porting the L29 Gen 6 heads with the big 'swirl' lumps in the bowls?

good info thanks

Porting is easier when you think about air as a liquid. I look at ports as if they were a river. Where are the disturbances?

And d00d has a sick chevelle 😁😁😁

I did get bench numbers from my 781's that I ported (first time porting anything). I'm curious what your opinion is on my numbers Mark. I'm using Ferrea 2.19" 1.88" back cut/swirl polished. The guy that ran the bench only flowed on port, and I'm not entirely sure which port. But here goes.... .200=151.5 ex 114.2 .300=283.2. 147.1 .350=266.1...???? 158 .400=287.5. 169 .450=297.9. 178.1 .500=306.9. 186.2 .550=307.8. 193.4 .600=310.1. 201.9 .650=311.3. 210.3 .700=311.3. 211.6

What does a sonic thickness checker cost? And where to find one?? Great video, I'm debating on should I port my 94 7.4 Chevy heads, the engine is from a rv. I have a ovalport pergormer rpm I take and full length headers. A very similar engine made 330-340hp and about 450ft lbsTq. At a fairly low rpm. I'd like to get it to about 400hp. and 550 in the TQ! I'm curious about the truck heads, if they are worth porting? I know they are probably thin , of should I look in to some older model Heads. Maybe 70's heads I don't want to raise the compression much. I want it under 10:1, all though a 10.5:1 454 would be awesome on the street! But I want to run mid gtade gas. , and decent mileage, that is new to me. I'm used to getting by all the power and measure in gallons per mile!! I'm rambling , great video

you make more flow and power in the bad int. port if you use a 37 45 67deg bottom

I'm having a hell of a time finding these burs. Anyone have any links to good quality burs?

wow

Awesome video. I understood that the 2.19" valve port would flow poorly but I don't know why. It makes sense by looking at it but I don't understand why it make sense. I have often had this issue where I understand why or how something works but couldn't explain why I know it if my life depended on it. Perhaps someone could explain precisely why or recommend a book that would help me to understand the basics better. I would very much appreciate it. Thanks

I would like to see what you could get out of a set 990 square port heads

👍

How about porting and still use the 2.06 and 1.72 for up to 5500 rpm on a 496 engine will it work ok ?

needs better lighting.. besides that awesome.. thank you.

Do you cut shanks on burrs? I find around 4" easier to control than stock 6" on the motorcycle heads I play with

Mark, apples to apples would the rect. port be a better choice over the oval but just too rare to find 50 years later??

Can I pay you to port my 4.3 liter vortec. V6 heads? Please

I want a Tapout Tee shirt

You state that the modified port (as originally drawn) won't flow past .500 lift but fail to explain why. The statement at 9:28 lacks an explanation too. (I know why. Just pointing out the failure to offer explanations.)

Come malaysia..and i show u ..true speed

ohhh ffs the greatest velocity of flow is at the center of the conveyance wether air or water change the damned valve so your air isn't running head long into it and the rest piles up behind it would you fit a large circular object to the front of your friggin cars to go faster and it would make a terrible spoiler. the valve is always the biggest problem no matter what shape you make it. the friggin slug in the intake is being slowed down by it

Ga ngerti bahasanya

So dark,,,,,, the head is already sliced in pieces, why not pull it open instead of looking into dark ports?

informative, but drawn out waaaaaaaaaaaay too long. sorry, cant watch this.

I tried to watch this but unfortunately, I kept getting distracted by the paint peeling from my wall.

worst camera person ever.

Ford

I see thousands of dollars in machine work..be better off buying crate motor..and be done with it....

This video shows why Chevy sucks, but nobody wants to hear it....the only advantage to Siamese ports are in the length of the intake runners