David Vizard's PowerTec 10 EP 28 The ultimate youtube head porting video
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- เผยแพร่เมื่อ 19 ส.ค. 2021
- In this , episode 28, DV shows how to 21st century porting technology can really make for outstanding results. The heads in question here are the double hump 186 head castings from the late 1960's and early 70's. The techniques involved here can be applied to all 23 degree SB Chevy heads as well as many non Chevy heads. DV's tech is about the best advice you will get anywhere for top notch performance.
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The years of studying and reading your books is now paired with video!
I studied mr wizards books for years. In application he is on point. I did well with na applications. Well worth the effort.
Still trying to absorb all the information you put into this video. Probably will need to watch it a few more times. Really enjoyed the hands parts followed by the IOP results. Thanks David for putting this out for us.
Thank you David for the great insight on these cast heads!
Love What you do glad you are sharing knowledge that could be lost
Every posting is a seminar thank
you so much and your presentation
Is so enjoyable
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All I can do for you sir is say thank you and add to the algorithm
And hit the like/share
These episodes are the best real life videos out, for what you're trying to do. Even with 50 year old parts, you're showing what's capable with them vs. the newer tech out there now. Tons of knowledge being graciously learned. Thank you for doing this.
I have a article from the 70s where Smokey Yunick specs out a 355sbc in detail for super speedway at the Best Damn Garage in Town. The heads were cast iron turbo heads from Chevrolet that were cast for race teams, later named BowTie heads. In the end, Smokey ended up with 580 livable reliable HP in racing trim that can go flat out 500 miles. So he claims. I guess if the engine was built by Smokey himself, that would be the case.
Were those 292’s with angle plugs?
@@cjbert6790 Yes they're based off the 292 casting. Smokey claims the straight plug heads are only good up to 11:1 compression, where the angle plug heads are great up to 12-12.5:1 High compression ratios tears engines apart in long races 500 miles and more. It all started in the early 70s, but the early 80s Chevrolet came out with an improved version, casting #14011034, blocked exhaust crossover, 7/16" studs, 1.5" spring pockets, angled plugs, thicker decks, larger water passages, tin alloy in the casting, 190cc intake ports, true 64cc chambers. I have a set on my 355 10:1 big mutha thumpr cam in a 78 nova. Runs like a scalded dog. Sorry for the long reply, got carried away.
joe smith Thanks 😀
@@joesmith306 Yeah! Awesome!
@@joesmith306 .....Actually the biggest advantage of the "292" casting isn't the angle of the spark plugs...but the fact that the plug location was moved more towards the top of the combustion chamber....This allowed better flame travel for high compression piston domes (most modern aftermarket heads have the relocated plug position in straight or angle configurations these days.) The 292 head has a reputation for being easily cracked....I have a nice set of uncracked 292's in my collection....Ported by Ryan Falconer when he had his shop in California. The later "Bow Tie" heads have a way bigger "hump" in the intake port "short side" leading into the valve bowl area....Porters used to the much flatter floor of the 292/186/461 type heads really struggled at first to make flow numbers when the Bow Ties were 1st released....I have a pair of Phase6 aluminum Bow Tie heads new in the box somewhere...Should probably give them away....They were $900 pair of cylinder heads when they were purchased.
450 torque on 10 1/2 to 1 from old camel humps is amazing freaking amazing!
Ya that's impressive
I watched the Entire 186 SBC Head Porting Video by You David.
Thank You I learned a Ton more from you this Sunday morning.
Excellent stuff from another automotive magician, David Vizard's books helped me in the mid eighties. He now has Videos and seminars to make more horsepower. Need to apply this to extract more power fro my cossie BD engines... GOD JOB David, .........Jason Chen ...Trinidad
Thank you David for your great insight and techniques. Best of the best!
The wizard
Keep up the good work DV. Really excellent quality videos so far.
Absolutely will have to watch multiple times to grasp as much of this killer information as possible. Thanks
Appreciate seeing the process of radiusing the throat! Great video. Thx
Great video, David and crew! I’m learning so much!!
Well, I can see I'm going to have to watch about a dozen more times. Seeing the old 186 work REALLY well is an eye opener. The vortec with its cracking issues if you go too far, finally has a decently good rival on the street. Thanks for the video!
😂 That's one of the best stories yet. The guys had no idea the legend himself had ported the heads on his engine and soon found out
This video ties in all the other ones now I can see the big picture excellent Mr. Vizard
and for showing us this craft before
It’s forgotten.
You have such a great way of sharing your knowledge DV. I just wish your porting schools were available here in Australia.
Great video! I am planning on applying these techniques to a set of 416 heads. If the numbers work out, I am thinking of installing them on the 400sbc in my truck. Thank you @David Vizard Performance for all the videos you are making!
Another great video thanks again for your help I'm going to atempt to do my head's my self and I feel confident that I can do them properly thanks again
Thank you so much for this video. I’ve been pecking away at a pair of 186 heads. I’ve got the ports close but I see a few more tweaks. Absolutely love the chamber info. Was still studying what to do there. Now I know exactly what to do. I’m stoked! Thank you thank you!
I have a 5.0 coyote with good power but was thrilled to watch this and enjoy David reliving history as he made it
Great video thank you David
I've been binge watching DV getting ready to do some heads for my daughter Landspeed Ford Ranger project and her MGB GT Landspeed car along with Gramp's Porsche 944T Landspeed car. I really enjoy DV's delivery, easy to follow along.
Great video, been playing with using smaller valves too
Great show! I’m definitely learning more!
Now, finally, I understand what performance porting is. Thank you.
Thank you David you're videos are amazing. Not a lot of people with this experience and willingness to share their wisdom. Got a 289 in the shop pretty cool stuff. 355 with vortex heads in a jeep some match and bowl porting 9.5 compression. Thanks again David.I love all the old school stories Jw shop time.
This is REAL Gold. No one else takes the time to study and explain these things from these points of view.
Extremely valuable. Thank you.
Thank you for sharing part of your sea of valuable performance knowledge , very much enjoy all your videos !
thanks DV.....this video has so much info for us mere mortals.....i have been doing my own heads for 390 small block mopar lately.....basic port cleanup....polished chambers....opened push rod pinch and little widening at the guide....only with abit of confidence after watching some of your videos.....cheers
Thank you David. Will probably watch this a few times to help it sink in. Interesting as always.
Brilliant presentation. Thank you.
You are my hero! I started reading your books in high school. You really know your stuff.
Pure gold. Thank you very much. I see the port mean area to intake valve area is 71.5%
Learned pretty much everything i know about performance carburetor tuning from this man
I‘be had your head book for years. This takes it to a whole different level. Thanks
Fascinating detail. Amazing results from old cast iron heads. That combustion chamber/exhaust "exit ramp" makes too much sense ! Certainly worth a try for a "budget" builder before opting for new aluminum heads. I have "learned by doing" just "going for it" since the 60s. Made some mistakes, for sure; but still learned. Your guidance certainly assists in avoiding unfortunate errors. The more I learn, the more I realize how much I just didn't know !
Mr. Vizard, thank you very much for taking the time to share some of your professional experience in this video. I have entered my email for notification on your next porting school and will look forward to a 2022 schedule posting.
Amazing video, the best I found so far. I work as a CFD engineer and worked on some high performance engines (350 hp/liter turbocharged and 150 hp/liter NA), but there were some really cool ideas in the video that i never even considered. Thank you!
Such amazing knowledge and clear explanations. I learnt engine hp building skills from your books 35 years ago. Much appreciate your TH-cam channel, as I've still got a few personal engine builds left in my old bones
Thanks for teaching me. You're the best. Would love being at your school when I come back to the U.S.
Herb - we will put out the red carpet for you!
Thank you for the information and story . I am a retired heavy machinery mechanic and now play with engines for fun . I have a go - power water brake and flow quik machine for testing . DV books and videos have taught me how to get great results . My latest project is a set of 1957 chevy power pack heads . I am amazed how accurate the information you give is . Thank you Sir .
Thanks for sharing your knowledge with us. We are out here soaking this up. I've been Porting and running the earlier castings 461 & 462's for 40 plus years now. Wish I could have seen this video a long time ago. At least I have been going in the right direction now I can understand where and how to improve my ports. Cheers from Aussie mate.
Peter, you are welcome. In my book Australia should be a #1 tourist destination. Great country - great people.
It's Wonderful watching the Master at Work and listening to what he has learned in the last 50+ Years. I remember buying his books as a teenager and I'm almost 59 years old and ready to retire. I've purchased a Souix 645L valve grinder and a Souix Valve Seat Grinder Set and an nice assortment of Nuway seat cutting toys to keep me busy while I'm retired so again, I'm watching the Master and soakingl up everything I possibly can! Thank You David!
This is jack Burchnell I want to take a min and tell you thank you so much for sharing on the 186 castings I am close to finishing the first cyc head this is the first time that everything is in place for me to do this work and and I am well pleased with the results I just want to say thanks
I am confused because on the floor side of the port, I see much more "radius" (as in smaller radius) than I see on the ceiling side of the part (virtually infinite radius, almost straight up except for the tiny lip for the valve seat itself). In other videos, David is saying that you need "more radius" (which I interpret as bigger radius mathematically) on the ceiling approaching the seat as that is where the hot spot is for airflow. Perhaps more laymen terms would help here, such as "sharper" vs. "wider" curve. BTW. I *love* the heart, soul and wisdom of this man. What a blessing to have his knowledge being shared with us for free. I wish I could attend his classes but family obligations will not permit.
Another fine hour in class thank you DV.
Awesome video David. Hope you have many more. Been readying your stuff for years. Thank you for sharing.
Randy my friend - you are welcome.
Haven't talked to you in ages how can I get a hold of you.
@@randywheeler652 I am busier than a one armed wall paper hanger. You just have to hope I can get to the phone.
Meet Mr Vizard years ago at the Engine Masters Challenge. Very knowledgeable and a wealth of information. Joe C
Great teacher, very informative.
Your knowledge is tr truly inspiring and is greatly appreciated
Excellent information again. Thanks DV.
Great job showing and telling, I have learned something about porting thanks. And well see ya next time see ya bye bye.
Thank you David for yet again another very informative video. I still cannot fathom why more people have not hit that subscribe button. Also thank you for increasing the number and rate of video uploads. I appreciate most of your subscribers are V8 guys but any chance of doing a series of videos on 6 inline iron heads for us old school classic car guys.
principles are the same.
specific details might vary
I was so young when I first found his books the colorful picture got me in it and I was interested in performance cars of course but then right beside the pictures would be vital information about how engines worked he was pretty much my education on engine performance. The hands-on experience came later.
Thankyou Sir, your knowledge and experience are a blessing for us, the less capable
Thank you for a very interesting hour of education.
WOW....GREAT STUFF! I used to buy all of DV's books when I was younger.....I still don't recall the subject of "Trapezoidal" intake runners being in any of them.....My very intelligent friend brought them up years ago but, I had trouble grasping the concept....Now I see where I was FAILING in my neophyte era of cylinder head grinding.....Then the discussion on the inward port bias of the bowl and transition has made my lightbulb illuminate. The exhaust valve treatment was rather interesting also....Such an "out of the box thinker".....Thank you for sharing your talent and knowledge with us "children of a lessor God"......
thank you Marvin and Davis for enabling translation god bless
Thank you Mr. Vizard!! Good work.
I absolutely enjoyed watching this video. I've been porting for 30 years,the first heads I ever did was a 596 power pack castings I put on a 357 cu in engine with a flat tappet .500" lift hydraulic camshaft and made around 450hp with a 1.94 int and 1.5 ex valves. I was very pleased with the results of that engine,best run on pump gas was 13.3@ 105 mph in a 4,400 lb car with driver.
Power Pack heads, can't give them away these days, but I've seen a few examples where they can be made to perform very well.
Excellent video, thanks!
Great video, David and crew!
Andrew - Thanks
Awsome job
God bless you my bother. I bought your book how to rebuild a small block Chevy at 17. Years later at 58 I am building a ZZ4 cone and going back to your book for advise. Still after all the years gone by still the Bible!
Dam !! I love this! I wish I could go to your classes. I would like to be 30 years after seeing your stuff. You just have to much info to put on a short video and I love it. I do wish you had mopar stuff but I get it most of the stuff out there is GM . Good luck with your task of trying to help us all with your knowledge and I really hope you get it out there.
Richard - as for Mopar - you might just be in for a surprise!!!
@@marvingvx1 YES!!!!!
Juicy bit of history, this one. Feel like I grabbed a fork and had a t-bone.
I remember some people on the internet forums that were not nice and respectful to you Mr. Vizard. They judged you without knowing your knowledge and experience. Isn't it funny how people are on the internet. Thank you Mr. Vizard for sharing your experience with all of us. Please never forget that you are appreciated 🙏 sir.
David...I think its truly a great thing you sharing your years of hard earned knowledge with us.....great work on the videos.....please keep them coming as long as time will permit....also have u ever done any work on vw air cooled flat 4 cylinder heads.....? Thanks again 4 sharing your wisdom.....Regards Brian
having been involved with the fascination of engines since the age of twelve ive just compiled a list of all the cars bikes and others with comments on most,,ive 2 real storys on 2 engines i went over board a little,,,this would warm the cockles of his heart ,,shame he lives on the other side of the world few hours of chat in real time would produce smiles all round,,,,,, moses mechannic swansea
I would love to see a similar video on a 5.9 magnum head. Thank you for sharing your knowledge and expertise.
This channel is dead for now, find his other channel here: www.youtube.com/@DavidVizard
Very technical information. Thank you!
J.L. David Thank You 4 sharing Freely Your years of experience, having been an Automotive Machinists & still a Drag Racer I've always shared what I've learned with others & I've had 2 take some Flack for that, But the Knowledge is only as good as the Hands applying it !!
I some how found that the 426 street Hemi exhaust valve is a 194 with same end 2 end length with a 5/16 stem ?? Might just gain a little more flow ?? Again Thank You David
well i am not ashamed to say ive been doing it wrong for awhile now lol. at least i have gained the experience to understand this and realize the greater potential that is there. its great.
Old school heads, old school porting techniques. I learned some of these tricks years ago. David knows more than me, thanks.
Cj I am not sure the the term 'old school' applies here. Many head porters, including pro's, won't be where I am now in10 years time. There are a lot of stubborn ones out the. It seems to me that so many of the smart ones attend my classes and so far I have had 100% approval rating from these guys and at least half of them were championship winning engine builders.
David Vizard Performance I’ve known many engine guys and racers over the years. I just try to learn what I can.
@@cjbert6790 Good for you. I fully understand the root cause of your comment and I thank you for honest, from the heart, criticism.
DV
That was straight up AWESOME!! Great detail, explanation and work.. Nothing like seeing what is being explained! And you do it sooo well!!.. I wish I could sweep the shop, or anything just to get my foot in the door!! Awesome video, I would love more detail, I'm working on a scooter head, I need to seat a 21mm valve, maybe go up a size, if I can find a 22-23mm, 70mm long valve with 5mm stem, I'm trying to get about 4x the original power, but it is near 2x the displacement, it was originally 49cc and is now 82cc I also have another engine it's 88cc I may get a stroker crank, to make it 96cc, the head for it has 21/23mm valves, I would love to port my aluminum SBC heads, one set is on my 385cid stroker! Maybe some day!!
James - best of luck with your project!
Thanks so much D.V.
Great video, lots of knowledge imparted.
OUTSTANDING!!
Thank you Sir!
Thank you for all the great videos. I’m just trying to absorb all the information. Can you make a video on how exactly you clearanced the quench pad to the exhaust valve. I have a set of Chrysler magnum heads that I am doing and have the same issue with clearance to the exhaust valve just before the overlap period. I can see clearly from the video what you did but I need more specifics. For example do you use the flow balls to decide how far to go into the quench pad in the combustion chamber. Thank you
this maybe off thread. in the 90s i had your book "tuning bl 'A' " series engines, with the valuble infomation in your book re: carburettor inlet stacks and ram charging and help from Brian kenny at technical dept at Tillotson in Ireland i was able to heavilly modify and vastly improve the carburettor on my 100c kart which i was racing . i made an ad hock flow bench with a vax vacuum cleaner, a plastic box and a gunsons carb balancer ! i was able to increase power a lot ! i had loads of fun and i learnt a gret deal . i would like to take this opertunity to thankyou as you were in part responsible for some of the trophies on the shelf. now i have found your page i can glean more knowledge .
Awsome video! I am amazed with the detailed information. I am currently working on some 5.9 magnum heads and i am trying to determine how to port the intake ports. The t g p side of the ports are narrower than the bottom and there is a very large bulge on the topside for the rocker stud. Any info relating to this would be greatly appreciated! I would love to see a video on these heads. I am always looking forward to your next video.
Enjoy your videos . Love the real world info
This reinforces faith a great deal. Everyone still sees real racers and street cars going at it with the double humps and copies or variants. i would very much like to try porting the AFR enforcers as cast heads to keep up with these classic ported heads and see what i can do. Its got great seats radius from AFR, if i can build upon that from reading david vizard's books and articles, and these videos. A lot can be done. Thank you David Vizard Performance, you bless god. Of course i may try and spend 3000 for a set of heads done by you. And everyone, you can paint your aluminum double humps to look like nostalgia iron 2. Awesome.
Ported a set of proheader sbc heads (same casting really)they have potential. Pinch area gotta be careful
Metal can get foamy when youre going after it but still went 308/23x first round by .600 and carried to .750 or so
ONly removed a few cc of material
Thanks for video!
Thank you David
Jepp! Now i just have to translate this tech here on to my Ford 200 inline six head, wish me luck..
Love this stuf, thank you DV!
I am thinking the for my 200 inline 6. ??
David I've done alot of similar techniques to my e7 heads which flow numbers climed to 600 lift and the car has been 10:80s with a stock 302 with a duel plane intake and an off the shelf Anderson cam thank you for all you do your far above anyone in my book
I have just started on a set of super ported E7TE's. These will be a max effort set restricted only by the casting thickness.
I cant wait to see a video detailing the E7 heads
Also, laying back the intake wall farther next to the plug, as you do on so many other castings, small and big block engines, would increase flow too? That part of the chamber is solid steel except for the 2 drilled plug cooling holes.
I am getting ready to do these same mods to a set of power-pak heads.
Your info on bowl prep and seat radius is so welcomed and thought-out.
I throughly enjoy your books, and videos.
Thank you..
Really great insight into making torque and horsepower. I’m guessing the port velocity and energy gains vs the AFR as cast heads means the ported 186 castings were smaller but more efficient. Some prolific dyno testers suggest that bigger heads, as opposed to more efficient heads, make very similar results. It would appear the greater difference is in the middle of the torque curve, where the greater port velocity, and therefore energy, makes greater torque. More average torque makes a better engine, no doubt. Also interesting, the idea of using this info on as cast TFS aluminum castings. I’d love to see the dyno results there!
Brian, You are right about what you say in the first part of your post. As for the second part we do all the head mods like this so your wish will be granted. Just keep watching!
Been nice to see an actual comparison on engine dyno
Love this video. I would love to see how you would approach a 4v head on a motorcycle
Excelent video
Damn a video by the legend himself porting!
I will take these lessons and apply to the briggs and stratton ! :-)
Explains why also 1968-72 Pontiac D-ports and Roundport exhaust iron cylinder heads work so well with modest airflow. Fully machined chambers are unshrouded relieved as you do in your Video ! Just checked with a 1970 Year D-port Pontiac 350 #11's and Pontiac 455 #15's heads in the basement !
It has now become possible to 3D-print Aluminum. That means one could CAD a model of how a head should have been, valves, intake tract, camshaft and all, to fit an existing engine. For the work of designing and drawing it up, and a couple thousand dollars, one could have the printed Aluminum piece in hand.
One would need to clean it up, and of course it would be worthwhile to put a little old-fashioned work into it to discover the next iteration of the design.
I bring this up because it brings the prospect of straighter intakes and optimized valve size, as well as potentially avoiding material thickness issues in the design phase.
I hope you can someday lead us through to this new era!
This info, what I can comprehend of it, may be useful to me in attempting to port iron big block Chrysler heads. Though the bore centers are different from the Chevy, the ports and chambers (#516 '67 castings, closed chambers) look quite similar to these novice eyes.
made perfect sense and I thoroughly enjoyed it. Thanks for posted. Oh yeah, I subscribed