Final part (#3) of the super porting Vortec heads video.

If you want more power with less work this video, by international head specialist David Vizard, is just what you are looking for. With over 50 years of flow and dyno tests, plus smoke tests, wet flow tests, CFD tests and much more DV shows what to do and, equally important what not to do. If you want to pick up as much as 80 hp then what this video along with parts 1 & 2 is for you.

[@Foryourinfo369]

I followed all of these steps in 2020 on a new set of vortec heads from summit. GM ones. I run them on a 98 vortec roller block with a xr276hr. It runs very well! Thank you so so much for making this knowledge available! Stay away from the "no go zone"!

[@khlausew347]

David I wanted to thank you for passing on your racing engine wisdom and knowledge on to the next Generation. My brother showed me your magazine writeups years ago, and so glad I can learn more from you here on the youtube. I am looking forward to more on uneven headers for V8's regarding both firing orders, and how that can be calculated, and also how valve seat angles vs flow vs cam timing can be accurately sorted. Thank you again for all the excellent knowledge.

[@jb314stl]

This man wrote the book on porting cylinder heads👍🏼👍🏼

[@jimpowell764]

Awesome stuff, I call you David Wizard.

[@robertheymann5906]

Thanks DV It's not too often the best of the best share their secrets. Darin Morgan, you and Ben Alameda have taught me much. Awesome group of masters

[@bcbloc02]

Lots to be learned here that can be applied to many heads not just vortec.

[@Sam-hj8hy]

I think I have a porting book with you name on it. It is good to see that information explained out .

[@knowbull5hit590]

Thank you for all the knowledge and proof/real results of relatively basic modifications

[@charlesl6925]

I love this guy

[@ICONBADGTA]

I'm sorry for your loss David.. Your loved one has my prayers tonight..

[@rennypizarro4432]

Great video. Very informative. I feel like I am in auto shop engine rebuilding all over again. Thank you Prof. Vizard.

[@lynnrunningdeer7364]

One of these days I might catch up😒. Thank you for all you do🤗.

[@mrkultra1655]

Thanks David

[@briantayes2418]

Great detail, I learn more from every video. Thank you!

[@troymecey]

Nice video. I never did understand the "square" spark plug boss but have you CC'd the chamber now that you have removed it?

[@seantroutt3291]

Great set of videos David. Have been following you since I built my fist engine in 1980. I did have a question about a part of the porting that you did not touch on. What is the strategy when porting the transition into the header? When I port heads I do not port match out to the diameter of the header. Instead I will leave the port one or two sizes smaller. As an example, if I am going to use a 1-5/8 round tube header I will port out to something just slightly smaller than a 1-1/2 round header gasket about 3/4 of the way around the port. I typically do not touch the floor of the port when doing this other than to smooth out the cast surface. This way I reduce the dump loss into the header, but still leave a little ledge all the way around to improve anti-reversion.

[@noahnichols6385]

david i called terry walters for cam the lady there asked him and he said he was too busy to do cam selection any more where do i call

[@jeremystory6981]

Thanks again for big points,,master time for making small engine run,,😊first make little bigger 😅😅

[@johnshackelford6965]

Derrick Vice Grip Garage 😳 House of Mopar it's fine 🙂

[@pmd7771969]

I've done this for years on vortecs

[@kyleoden7656]

Can you do a video on bigger values on the intake side of vortec heads like a 2.00 or 2.020 lots of people say its a waste of money because it does not for flow i wonder if thats because maybe they aren't d shrouding the valve

[@frankbilotta6302]

Chancellor Vizard

[@bengriffin8071]

Would love know what's going on with that chevy big block 396 build that you mentioned months ago. I gotta 402 big block that I would like to stroke for street some day,

[@stevedriver1476]

how much can these heads flow like this or do i just buy a set of 200 or 215 brodix at $1700

[@pmd7771969]

Wink, I have all his books

[@pmd7771969]

When u use a valve with a built up base. Tulip, valve it gets heavy.

[@thomasleclair7418]

,,,,,,,,,,,,,,,,,,,,,,,great dedication to the craft of porting for power,,,,,,I liked the moody music......................

[@GriffonGrowl]

Do you do just a 45 degree cut on the exhaust valve, or do you do a 3 angle valve cut,with no back cut on exhaust valve?

[@pmd7771969]

The best way is to design a valve that moves out of the way of the flow path.

[@pmd7771969]

So how much hp over stock david, sir. Mr. Vizard. Master wizard. Bloodviking

[@pmd7771969]

I was hoping for 75 to 100 cfm over stock.

[@user-qk5nh9wu2c]

Dear David, what program are you using to analyze the data, from what I see it is your own design, where can I get it?

[@timjenkins6049]

Why is .700 being used for lift testing on iron vortecs ?

[@isaacandruthruss90]

How much power would you expect to get from these heads if you were to set it up for dirt track racing?

[@isaacandruthruss90]

360 cubic Inc max, Can have Any compression ratio, must have pressed steel rockers Obviously with a intake, cam and exhaust you've specified. And runs on e85

[@r1learner178]

What happened to this channel, there were are lot more subscibers not that long ago - I have to re-subscribe for some reason. Is this a new channel or something? Great video by the way David, very informative.

[@b.c4066]

New channel, he says so early in this video

[@cesarbaretta4050]

it's best if add animation

[@pmd7771969]

Creepy music

[@pmd7771969]

Now turbo it......

[@pmd7771969]

Modded

[@pmd7771969]

I think the port wasn't shaped correctly at the underside guide wall. He could have removed more from the roof as I did. Bv