5 golden porting rules - #1

In this, episode 30, of PowerTec 10, DV looks at the absolute primary restriction to air flow into your engine. From there he goes on to some of the ways to fix that primary restriction. What we can guarentee here is porting info that you won't get from even most of the highest caliber pro porters.

[IOPOrt]

I can not tell you how much I am enjoying your videos, the opportunity to experience "Data" rather than "tribal knowledge" and the experience of 60 something years is something we would all be foolish to ignore. I look forward to every video and have told all my gearhead friends about your site and never miss an opportunity to like them. Thank you and keep it coming. Please.

[frankromero]

I started Drag Racing in 1967... David Vizard's books were my Bibles back then... I'm very glad to see that you're still at it... I'm 73 years old now...I'm still at it too... I've only been building High Performance Harley Engines for the last 20 years... I stopped building automotive, diesel and marine engines back then... CrazyHorse Speed Shop NJ

[fernandohood]

A Guru breaking it all down for you free of cost.

[TheDrAkira]

I took a full course on engine tunning for racing a few years ago and I'm proud to know that my professor explained to us the same as this great man here. This channel is Gold. So many people talking nonsense nowadays, but this man is great!

[eddiesheeran]

This is literally a free engineering-level course in cylinder head flow dynamics. Thank you for making & sharing this!

[rodrigograss]

David,

Thank you so much for sharing your knowledge.

It is greatly, greatly appreciated.

No amount of thanks would suffice I think, but rest assured i'll at least help share your insights with others.

[qoinsmartme]

Respect to those that share their acquired skills and knowledge, which most definitely includes you David, Thank you. Had to reply to the malicious keyboard warrior previously, who, I believe is stuck in a world of hate. In reply, today we have an exponential volume of knowledge, led by Dr Google, good bad and indifferent. However principles remain constant and are enduring. Remember over a century ago twin cams, multi valves etc were already being manufactured. In the US mass produced car engines didn't reach a hp per ci till mid 50's. The evolution of fuel, alloys, man made fibres, casting techniques, machining and most of all, in recent times, silicon (as in computing) have revolutionised our world including automotive engineering. I will put my faith in a human being that has honed (punn intended) his skills over half a century and is prepared to share them. Thanks again David.

[UrbanHarvesting]

Hands down the best book I have ever purchased, cover to cover gold. My 1st port job was after reading your book port & flow test the engine was a dirt speedway ford 6cyl 250ci crossflow for Australia. The car won everything it was entered into for 2 years on the same build until I built a competitor car motor, the 1st race they were both in 1 x new 1 x refreshed they ended up 0.3 apart over the finish line and 3/4 lap ahead of the field. I have always wanted to thank you for all the shared information you have learnt in your many decades of building/racing and shared with the greater racing/engineering community. I have recommended and quoted you many times since, only just found you today on YouTube.

Wish you were in Australia I would gladly work for you as a learning experience

Looking forward to the next videos in the series

Thank you David for sharing

[mikedearman]

You wrote your first book 7 years before I was born!! Outstanding, love this. Like watching my old chemistry teacher talk about machining. Thank you!!

[TheFarCobra]

My friend Corky Bell once described David as the best combination of a genius and a practical man.

[exploranator]

Learning more than I knew existed for decades in head flow and porting!

[rondye]

Smoky Yunick claimed the point of greatest restriction is at the valve. So valve/seat angles and the 1 inch above the valve is where to find the power. Of couse much work has been done since he was in the game. I have great esteem for David Vizard and Smokey Yunick.

[captainsledge]

Usually I skip over old timers, because some of the guys I've met or watched haven't the slightest clue how things actually work. They just have their ideas and theories. That may have won at the local sportsdrome lol but in today's engines they are lost. "Too many wires blahhh" lol
There's still old guys saying 305 heads on a 350 is the way to go. (It's not, you lose so much cfm flow in the runners it's crazy)
Then u have those guys who say they tried vortec heads on a sbc. They're junk. I ask em which cast it was. They said it came off a 90 Chevy truck. 😂😂😂 bro that's swirl port. Worst possible head out there. They think the center bolt valve covers automatically mean vortec heads 😂😂

Anyways My point was... this old timer right here knows some shit and I like his channel already. Subscribed.

[martinfahrni]

Born in 68 I love your knowledge, churning these lectures like candy, probably never gonna build another small block again, but you are feeding my dreams

[ferrellvance]

what a great Wizard, I am a retired 71 years old, and just got inspired after watching this genius give us his lifelong experiences, I just tore my engine down, sent it to the machine shop for my first major rebuild and blueprinting I will be doing myself, thank you sir for all you do, the world could use more gentlemen like you!

[michaeltruscott]

If only these shows were not available in the 80's man do I wish they had been what an incredible amount of dyno time you have outstanding job ol man

[stephenrocque]

I saw your YouTube videos – excellent work ...I have some of your original books from the 1960s and 1970s Keep on going Mr. Vizard

[timothyjudsontaylorofficia]

When a legend of performance speaks, it is wise to listen.

[goodboyringo]

Hi David
I just came across this video and found out about your daughter Jacque's passing.
Once learning of your beautiful daughter, I need to give my condolences to you and your wife.
I read about how she was an engine builder and what a great soul she had.
So I just wanted to say that I feel your sadness for her. She is in good hands with our great Lord Jesus Christ !

[psi]

Very interesting. Especially as back in the day we just used to just port match to the manifold and kid ourselves we were making more powa