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.
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.
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.
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.
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!!!
I put in a soaker tub once and was frustrated at how slow it filled. I took the faucet off and ported it like an engine. It flowed like a beast after I was done!!!
I mean, technically air is a liquid by definition. That's why the word aerodynamics is defined as the study of fluid motion and is still used to explain how planes fly.
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
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
Pretty sure it's momentum and direction of the airflow. Air intakes rely heavily on momentum to "ram" more air into the cylinder. Larger openings means a reduction in that ram effect but a potential increase in flow capacity if shaped correctly. Its always a trade off between air intake speed and flow capacity.
4" is pretty much perfect. The longer the shank the less control you have over the tool. I have done hundreds of motorcycle heads and they are generally more challenging as the ports are much, much smaller so control is everything. I use Foredom foot speed control units...great torque to run at slow speeds to enhance control as well.
@@trailerparkcryptoking5213 Youre probably correct with the enhanced valve size that he used and other tricks, he is a VERY smart guy with that complete build, from crank and balancer updates to everything else. The rect. port VS the oval from back in the day had bigger valves, i had a 427/425 in a 67 Camaro so it was a Yenko clone and had the 2.19 intakes like the 396/375
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.)
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
I love those cut away heads. It shows so much more than just looking at a hole. Great video!
Looking at holes isn't always bad, depending on what it's attached to.
I'm sorry. I just can't resist being juvenile sometimes.
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.
man I can't get enough of this il never be a machinist but being a hot rodder it's brain food
Makes sense. I use to run a flow bench for motorcycle heads. Mostly motocross. People always want bigger but bigger doesn’t always help.
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.
I really want to thank you for sharing your knowledge and helping others. I've learned a lot of important information from this series.
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.
Great video, Thanks for sharing. Those cut aways ROCK !!!!!!!!
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.
Porting for years. Still learning some thing new every day ,great video thank you for your time
Thanks for having an awesome channel!
Thanks a million mark, really appreciated, top notch... 👌
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.
This is gold! Thanks for sharing your knowledge.
man thanks for this! I've had so many questions and ideals about port polishing
Good vid. Well spoken, clear and spot on knowledge. Cheers.
Great Video Buddy 🙏 I Appreciate Your Time And Info
How do you go about porting the L29 Gen 6 heads with the big 'swirl' lumps in the bowls?
Thanks for your video. Im going to try to open my 460 e7 heads.
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!!!
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?
Exactly
I put in a soaker tub once and was frustrated at how slow it filled. I took the faucet off and ported it like an engine. It flowed like a beast after I was done!!!
God says, “Air follows the inside corner.”!
I mean, technically air is a liquid by definition. That's why the word aerodynamics is defined as the study of fluid motion and is still used to explain how planes fly.
@@sethh8892 Air is considered a "fluid" not a liquid.
Not being a dick, I recognize that you understand, but I wanted to correct your error.
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
good info thanks
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
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
Pretty sure it's momentum and direction of the airflow. Air intakes rely heavily on momentum to "ram" more air into the cylinder. Larger openings means a reduction in that ram effect but a potential increase in flow capacity if shaped correctly. Its always a trade off between air intake speed and flow capacity.
wow
And d00d has a sick chevelle 😁😁😁
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 ?
I'm having a hell of a time finding these burs. Anyone have any links to good quality burs?
👍
I would like to see what you could get out of a set 990 square port heads
Do you cut shanks on burrs? I find around 4" easier to control than stock 6" on the motorcycle heads I play with
@port nut thats what she said ...😁
4" is pretty much perfect. The longer the shank the less control you have over the tool. I have done hundreds of motorcycle heads and they are generally more challenging as the ports are much, much smaller so control is everything. I use Foredom foot speed control units...great torque to run at slow speeds to enhance control as well.
Mark, apples to apples would the rect. port be a better choice over the oval but just too rare to find 50 years later??
He proved these oval port heads are better to 730 HP! The torque with these oval ports is superior compared to lazy rec ports!
@@trailerparkcryptoking5213 Youre probably correct with the enhanced valve size that he used and other tricks, he is a VERY smart guy with that complete build, from crank and balancer updates to everything else. The rect. port VS the oval from back in the day had bigger valves, i had a 427/425 in a 67 Camaro so it was a Yenko clone and had the 2.19 intakes like the 396/375
@@zxtenn Richard Holdener has a video on rect ports vs oval ports, check it out..... the ovals outperform.
@@trailerparkcryptoking5213 Thanks, i watch lots of Richards vids, VERY smart and great comparisons
Can I pay you to port my 4.3 liter vortec. V6 heads? Please
I want a Tapout Tee shirt
needs better lighting..
besides that awesome..
thank you.
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
Ga ngerti bahasanya
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
So dark,,,,,, the head is already sliced in pieces, why not pull it open instead of looking into dark ports?
I tried to watch this but unfortunately, I kept getting distracted by the paint peeling from my wall.
informative, but drawn out waaaaaaaaaaaay too long. sorry, cant watch this.
Ford
Sucks
I see thousands of dollars in machine work..be better off buying crate motor..and be done with it....
worst camera person ever.
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
I guess that's why you still see tons of BBC's in bracket cars at tracks all across the country every Sat night.
Nice try but, fail.
I bet you're still in high school 😂.
@ddm4v3dd56 headed for summer school 😂.