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The only thing that's going to change the ratio during operation is if the rocker flexes or the fulcrum shifts.

Never buy Chinese crap parts

You should have put a 1.8 on the exhaust as well because the exhaust on those particular heads needed help. That's why you have split duration cams with more on the exhaust side as much as 14 degrees in extreme cases.

Congrats what happened to project 318(mopar)?

What is the definition of a 'booster' ?

Was really glad to hear this story David and am sorry i can't add more than one 'like' to this and no I haven't seen any of your previous channel videos but I am loving every single thing in every video you do, my favourite videos you do is on lightening rotating parts cause it free acceleration with out having more power. I drive rally cars and dirt bikes and lightening something helps, acceleration, braking and turning, horsepower doesn't do that 😅 good to hear your life experiences again and hope you keep it up as long as you can, thanks for all the knowledge cause it keeps my mind off suicide 😀

Love the channel very interesting points question to you is what are your thoughts and experience on gear Drives

Most of the numbers and terms in this video are way over my head 😮 no pun intended 😅

Anybody still using the Schubeck Lifter ?

You have some very good information sir

ok i agree with the formula, but are you referring to lobe seperation angle , not centerline of the intake lobe. LSA IS GROUND INTO THE CAM....WHILE centerline can be degreed to where you want it .. thanks

"Nascar Knowledge for Everyday Performance"

DV, a thought, do you have merch? I was thinking you, Andy, Brian, and Darin could benefit a bit financially by offering ball caps, t shirts, sweat shirts, and coffee cups, with your Powertec 10 logo on them. Put web addresses on the back.

May seem like a dumb question but what is the effect on mpg 👍

I loved this story 😅😅 just as much as learning technical knowledge from your other videos David lol

Thank you sir!

I sent the memo did you get the ,memo i wanna talk to your supervisor

Congradulations!

Thanks!

You are a true wisdom. Thank you for sharing with all of us your wisdom of knowledge. And a big congratulations on your success mr. Vizard.

Are you the same David vizard of Mini Cooper fame, I bought your mini book years ago forgot the name,but I remwmber the lotos engine on a mini gearbox, I even moved my clocks t o put a 45 Weber on my mini 1275,reborded it out to 1330 if I remember correctly but the battery box in the dash good old days building my 1275 gt clubman .i remember now how to modify mini,by David Vizard ,definitely a new subscriber,

SBC for life best engine ever made.

"The NASCAR WIZARD"

The only problem with your channel growing is everybody these days knows every dam things and ant willing to learn 😂

There's old guy here in my little town he had a very old tool that will cut the ring groove out of the top of the cylinder wall. It's a hand turned tool

I've heard good things of trick flow, thought of trying their SBC heads but want to get the best bang for my buck. I found out promaxx was made here in Alabama and what few videos I've found on them they seem under rated

Wats the latest with mission impossible 318 biuld haven't herd anything in awhile guys.

I'm presently putting togather a small block Ford 363 ci turbo engine. Am interested in your small block ford heads at the price you suggest. Please advise.

God only knows what lurks within.

I saw you are also building a 2.3 turbo Lima engine, for these 80s turbo car engines, how are you going about optimizing the cam vs pressure ratio(backpressure to intake) and turbine sizing?

Should be nice to hear from a Nascar engine builder (Brian Salter) in discussion of HP with you. Also please don't forget your teaser for DOHC head modifications via poly quad and 4 cylinder cam formulae. Thanks for your videos.

God that intro brings me back 15 years

I´m just pulling this out of my ass, but I think why the flow reverses on the underside of bends in exhaust ports might be, that the exhaust gas flow "prefers" to go round the outer side of the bend and creates turbulance and a lower pressure on the inside of the bend, that reverses the flow and sucks gas back into the engine (like liquid would, gas is only less dense liquid). I have no proof for any of this, just thinking xD

Here's an example of 'content earns it's subscribers'. Not cute stuff or BS, but fact based on research. Good on ya, guys. And hey, David: I've got a '62 Morgan +4 whose previous owner put in a D cam. I've got your notes from the '70s about TR head mods. So - Based on what you know now, what would you do different on that head?

One really big improvement that I made was fitting an exhaust manifold with equal length headers - all my cars revved so much quicker after that. I've seen adverts for Vortex exhaust silencers but haven't seen any real world before and after power figures - what is your take on this?

OMG - I just came across this by chance - you sir are an absolute legend! It was your magazine articles and books that got me into engine tuning. After modifying my engine and pulling up at some traffic lights a guy pulled up next to me and said "What engine have you got in that car? It goes like sh*t off a shovel!".

Had your books for years! Dave, what about stepped headers? Geez, I grew up in the 70s reading Car Craft and Grumpy Jenkins was big back then.

I'd like to see more race SBC builds. Say 15:1 compression or so or more. I can sponsor a camshaft of any sort if y'all are interested. Also, I could donate money for its dyno test. Keep up the fantastic work!

I have a Mallory water injector on my 1970 Plymouth Duster 340 with 10.5:1 compression ratio (factory), Hooker headers, and Edlebrock single 4 barrel intake manifold, and 3.55:1 rear gears (posi). I put it on to eliminate pinging after 1/4 throttle. It worked for that, but the power was way down. I did not want to mess with the timing or car jetting for fear of running out of water while out on the road. This car outran a 1969 Hemi Roadrunner with 3.91:1 gears with posi and comparable dual carburetion and headers that turned 12.17 the following Saturday at Orange County Raceway. Any suggestions?

You are both grown men. Grow up and discuss it like men. Misunderstandings and egos don't mix. Knowledge is to be shared not hoarded.

I would imagine oil pump gears distributor gears would be improved also.

NASCAR Narc

Umm 100k? Why does your stats say only 61k?

Thank you for the torrent of useful information and congratulations on your success. MOPAR poly head massage theory would make me very happy. 🎉 Try “NASCAR Confidential.” ❤

Hi mister Vizard First off all congratulations.I really hope you won't forget the polyquad video that all your 4valves enthusiasm have been waiting for a fair amount of time now .I am personally really looking forward to it . Best regards Julien Dubray

I must agree 100%. There are guys on the FABO channel that fight this, call me a repeater internet information, and claim their testing shows different. I will go with your resume and record.

How do you determine if you should use a single pattern or duel pattern cam? In particular on a BBC. Thankyou.

I'd like your thoughts on the current state of IndyCar, IMSA, and Formula 1.

Marriage will definitely lower horsepower