David Vizard's PowerTec 10 EP 21 302 SBF cylinder head dyno tests

In this , episode 21, DV shows not only the flow and associated port parameters but also the base line dyno results from which to judge subsequently tested modified heads. Using advanced porting techniques the power gains achieved were outstanding.
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[@johnsheetz6639]

I feel so lucky to be able to see mr vizard speak about head flow. His knowledge is unmatched! Complete legend!

[@curvs4me]

DV is a legend!! I am on the edge of my seat waiting for the next one.

[@ElvinLeadfoot]

10 Days Seminar with King David Vizard? Now Elvin knows:) I’m definitely going to try to attend a 10 day instructional session. Thanks DV - Thanks Andy :)

[@charlescrockett6208]

Your knowledge is only matched by your class. Marvin and Andy are such a good fit in your team,a "POWER TRIO" like CREAM! David you are Clapton/Bruce and Andy&Marvin are Baker(it takes 2 for him) I like the fact that every second is used, each moment is info dense. A couple of watches or rewinds are required to catch it all. I'd love to take a course just to learn. You , Sir are priceless. Meeting you is in the bucket. Thanks to you, we are all becoming "ROADS" scholars!

[@hugh381]

Lucky enough to have learnt about port energy from David back in the late eighties, it is the fundermental baseline to building very powerful engines.

[@needmetal3221]

I'm fascinated by the combustion chambers on that trickflow.

[@approachingtarget.4503]

Love the comparison to bullet coefficientancy . Very common for guys now days to measure the impact at long ranges. Realizing "speed" carries more impact then diameter and weight. Even with a smaller 6mm projectile and 100 grain. The impact retains the energy way out past 1000 meters. Dont ask how i know that!

[@donthompson2188]

Looking forward to this. Back in the 70’s I ported my 302 heads. Installed 351W valves and ported to match. Still running strong.

[@dennisrobinson8008]

When you have no flow any increase is a big gain

[@shanescrimshire8395]

Looks like a great series! Can't wait for the next episode. I have a set of 69 351 4v heads I'm looking forward to working on. No longer have the car to go with but nonetheless...

[@mikedeal8659]

Great video. So much presented but so much more to come. Looking forwards to the future videos. Thanks so much for putting out these videos David. Much appreciated.

[@jonsingle1614]

Like Xmas....I can't wait for part 2 !!!

[@n2diesel]

great lesson

[@mathewboyd3746]

Learning so much from all your vids DV. Just wish I could photographical remember it all and compile it all into my next two builds (yes, I've already read your head porting & how to build horsepower books). Heads are a big problem with the engine type I'm working with so what I'm learning is vital for me to build an efficient & powerful heads. And ultimately a powerful & torque laden built engine :)

[@TurboJohn74]

Thoroughly enjoyed this video! Always look forward to what wisdom is coming in the next session. I've had your book for some time, but some facts stick better hearing them. Cheers

[@falconater68]

I'm a fan of his no nonsense, to the point personality above all else...Get er done

[@rotaxtwin]

300 CFM from a 175cc port is impressive. Could make for a quick little Fox body!

[@philzellmer6073]

DV, Thanks so much for all your instruction, I've been reading, listening and following along with everything you've done since the mid seventies, (yeah I know I'm really dating myself here). As a professional mechanic, engine builder, tuner and general all around hot rodder, everything comes down to....WWDV do? Thanks again, can't wait for the next installment!!

[@chestrockwell8328]

This is going to be a great series of informative videos. I'm just as curious about all the short block details as I am the cylinder heads. Thanks to David and everyone involved.

[@mykatawato2043]

Another great video. Love the superior info that you bring to the table always. As an idea have you ever thought about doing a short video on some of the old orphan American V-8 engines of the past? I am thinking of your AMC engine file for 401, 390, 343, 304 and 290 engines. I think they deserve a dedicated video for AMX and rambler fans as I know there are many. Besides that maybe one more video grouping together all of the "other" lost V-8's that have driven into the sunset over the past 70 years like the Studebaker, Packard, International Harvester, Rambler 289, Buick Nailhead, Buick 215, Ford flathead V-8, early Hemi's, etc. I would love to hear your comments on these obsolete head and block designs and what can be done with them to improve performance. Sounds like great fun!

[@benrossbach6501]

Can't thank you enough for sharing knowledge.

[@whitelx]

It would have been nice to include the iron GT40 and GT40P, both stock and ported. I'd be curious on your thoughts and the differences in performance in the changes that Ford made going to the GT40P head from the GT40.

[@ts302]

Thank you Mr. Vizard!!!!!!!

[@markcarter78]

Can’t wait to see the rest of these results

[@lautburns4829]

Thanks David and Andy.

[@aaronshurrock4980]

Excellent video and can't wait for part two.can we get specs of the Chevy rods and pistons used. You said powdered metal rods so are they ls rods. Super keen to know.👍

[@johnmonroe961]

Really like to know Rod stroke and piston deal know it SBC.

[@michaelwarren9751]

Hi I'm curious about the Chevy rods and Pistons in the ford block what combination of block crank rods and Pistons are being used

[@JohnThomas-vb9se]

As always, thanks for all the info. Just curious why the iron gt40 head isn’t in the mix? I can’t wait for part two.

[@lafenatu]

Considering how often it is used on budget builds, I am extremely curious myself.

[@servediocylinderheads]

I can answer that, I did the E7's and two sets of 289 heads to help D.V. out for this comparison. I asked if he was interested in testing a set of gt40p I worked up and the testing was up to eight sets of heads at that point, so no more.

[@rotaxtwin]

I can certainly get behind the conservative camshaft / good flowing cyl heads philosophy.

[@dovemfg]

I’m 3:41 into the video and I’ve never heard anyone describe a 600 dollar speedmaster Chinese rotating assembly quite like that before. Sales!

[@marvingvx1]

Yes Mr. Dove Manufacturing I am a little lost here. Can you be more specific?? DV

[@marvingvx1]

To my knowledge I have never used a speedmaster product of any sort!!!!! DV

[@worldssickestmedia2713]

4:28 I'm glad to know the performance increases you can get with a machine as opposed to a hand job. 😆

[@323gtx88]

Started new bock collection

[@performancenaveia7821]

_marvin activates the translation so as not to lose details of the video thanks_

[@kenswitzer4133]

Andy said the flotek heads were good. How about the 180cc’s for the SBC

[@mattblack9344]

Q. TRICKFLOW 205*twisted wedge on DART shp 302w stroked to 347.4.000 bore 8.2 deck. Holley efi hi ram..cam choise for 666 hp.500 lb torque Roller, solid etc.? Pro street 1972 maverick coupe. 🇦🇺

[@martingagne367]

I will like to know the part number of. The Chevy piston and connecting rod

[@jdrods1519]

Awesome! 💪🏼

[@finnroen2334]

Your are ofcourse right. I alwas make new dynographs og old papers and I divides the curves with CID. Very seldom does anyone get to 1,4 lb/ft CID, but Steve Morris got 1,71 lb/ft/CID from a Pump gas 475 CID LS. It is here on youtube. It sound to good to be true, but it seem legit on the video. I comment would be nice.

[@terrygrover6440]

Hi david it's great to see you doing this with e7s we have gone 10s on motor and 9s with a 140 shot nitrous on a stock short block.check out Grover boys racing green gangster on youtube.Thank you for all you do your the best

[@MrGoldielocks70]

What do you think about the Cleveland heads compared to the Windsor head?

[@tonytate2964]

Where is the part two at

[@SpeedRacer-qn2uh]

Have 302 stock bottom half bored .030 over flattop pistons with valve reliefs, weiand dual plane stealth intake, 600cfm holly with size 66 jet, gm style hei distributor, 2.25 full exhaust with flowmaster 40 mufflers. Was atk crate motor rated at 250hp. Putting in afr 165cc heads standard setup, and comp cam xe266hr roller cam with magnum roller tip rockers 1.6 ratio, new lifters, new pushrods. How much hp torque do you think will gain with new heads and cam? Live ur videos.

[@hondatech5000]

Please show us how to area rule a 4 valve head like k20,2j…

[@unclesquirrel6951]

Awesome

[@GFPRACING]

I Have a Set of Sbf 302 { Cast Iron } Trick Flow Street Heat Heads . I Have a 2300 pound Pinto Drag Car . What Would You Charge me to Port Them . This is a Drag Race only ! . What do you Feel you can Do With them . Thank You .

[@GFPRACING]

what about the sBF DOOE head

[@ronniejohnson317]

I would love to know how many heads he destroyed to get all of this information? Also, I have never saw a pro use Harbor Freight stuff.

[@ronmaxwell6972]

Wow I learned a lot, thanks....quick question guy has a budget build using a stock 2000 Explorer engine he is looking at FlowTek heads and a cam with a smooth idle maybe a slite lope, 4r70w with 8.8, 3:23 gears 66 Mustang, daily driver looking for fun and mileage has set of TriY headers and duals and factory EFI (Explorer) and tuned ECM. Suggestions sir? What heads mods are cam specifications hyd roller?

[@superdansuper1]

Did you use 350 stuff or 305 stuff in this? Ive never heard of doing chevy rods and pistons in a ford

[@luckyluciano4968]

Hi David. What do you think of the Edelbrock performer RPM heads. This is what I run in SBF stroker 331. You mention all these other heads. There spec to the cam and intake. Which I purchased as the whole top Engine kit. Should I have did some porting or other improvements. I just discovered you through a classic mustang site. Thanks. Guido.

[@craigchiddo2794]

Is charlie in florida or New York

[@rustywater3219]

So why are the powdered rods so derided in the ford modular world? Is it just because of the size of the rods?

[@utahcountypicazospage5412]

Pay 4000 dollars for a head port.thank god for boost also is all this head work needed when boost is in the equation ?

[@hondatech5000]

DV do you currently follow F1 what do you think about Honda recent performance gain from the reliability update to the power unit combined with the new oil?

[@awesomearizona-dino]

Hello David, Question please... i took stock E7TE heads and had valve job with better springs installed, also i cleaned up combustion chambers. ( lower compression is OK for me) BUT, I unshrouded the outer side of the intake valves chamberarea a little bit. AFTER WATCHING YOUR VIDEOS, i now real that could be bad for turbulance. Otherwise i did some cleanup of entire ports, no more bumps, port matched, to Edelbrock Performer. QUESTION...do you think the unshrouding would be a big problem for detonation or pinging ??

[@marvingvx1]

Probably not!

[@user-rl5nv4lw5l]

Tell me how to find your books in Russian in Russia?

[@user-ng6sh6rh3j]

Никак, только на английском.

[@user-rl5nv4lw5l]

@@user-ng6sh6rh3j Недавно все видюхи были с переводом..политика((

[@KompressorPete]

I gave a thumb down - only as a critical feedback to an otherwise superb episode - I may be a tad slow or slightly confused but could You be very specific about the changes made on the baseline engine compared to original? I just like a list of changes to better get an overview of the power increase compared to parts/time/costs etc.. step by step. A lot of important info is being presented in a short time and my brain struggles to comprehend it all. Fantastic I must say and Thanks for sharing!!!

[@marvingvx1]

Peter, thank you for your forthright response here. Going through I should have spotted that inconsistency. I will go through the details in part 2 just for you and others who may have silently posed the same question. Thanks again for asking. DV

[@shoominati23]

David will you answer my question about bore to stroke ratios? Smokey Yunick used to say put the longest rod in a engine you possibly can, but that was in the 60s when cylinder heads didnt flow anywhere near like the tech of today giving a longer duration on the inlet stroke to fill through those poor flowing heads of the past. But the thinking today is the inverse ; people go for the biggest bore and the shortest rod / longest stroke they possibly can. Whats your take on this? I'll email this to you if you miss answering it, thanks.

[@davidvonanderseck8649]

My take on this I heard david say that only a portion of the bore is filled on the intake. Also what I learned is that it's about the pulse that acts as a ram jet Like the 460 has to long of a rod because when the piston comes down on stroke the longer rod glides down. I shorter rod jerks the piston to create a pulse to the intake runners to the carb I picked up on this on the rocker arm video. With 1.7 rockers the valve is quicker off the seat. Again creating a pulse to draw the airfield mixture Again in another video he was explaining flat tapet vs roller. It's the flat that allows the valve to open early allowing the lobe under earlier. I patularly learned this when I discovered the handycap of the 460. You can't get away with putting an aggressive cam with stock intake and injection. You can however put a high lift rv cam. I noticed the more duration didn't help as much as the sudden pulse of a 1.7 rocked and a hi lift rv cam will give me more power then a street cam with a lot of overlap. There's more power else where to be gained but I'm getting the science of all this.

[@davidvonanderseck8649]

I think Smokey likes thr longer rods because he was doing a different kind of racing. It was circle track. So I imagine he liked to stay in thr higher revs. RPM. Which with a longer rod you get a angle on the power stroke. But a shorter rod gives a nice quick jerk on the piston. This probably why a 496 gives so much more torque on the low. But a hi reving 427 will rev to the moon on a circle track. There's another equation I came across. On a 454 seems like the have more power of you bore it 60 over. Making the bore wider to draw I'm more air fuel on the top.

[@arturos.3973]

Like👍

[@davidreed6070]

Now that we're talking torque if you take a torque graft record it, then move it to the right, the new graft would represent an engine making more Hp. Would the second engine outperform the first, if so why. Every body says yes but can't explain why. I think they will run the same.

[@V8Lenny]

Because second one makes more power.

[@davidreed6070]

@@V8Lenny does a DYNO measure torque or HP. WHICH one is actual power.

[@V8Lenny]

@@davidreed6070 power is power. Torque times rpm is power so same torque at higher rpm is more power.

[@davidreed6070]

@@V8Lenny are you saying that a motor that makes more horsepower will outrun a motor that makes more torque. Some people say a motor that makes more average torque will outrun a motor that makes more peak horsepower. I don't know. I was never capable of making over 700 hp na but maybe a turbo will change that.

[@V8Lenny]

@@davidreed6070 engine that makes more average horsepower wins.

[@spud4ever290]

Howdy Howdy

[@petejoseph8257]

Did he say hand job? Hahahahaha

[@brucejordan9073]

When's the segment with some real information not just hot air, part 2 coming down the road. How did I miss the advanced porting techniques

[@hotrodray6802]

🔔👍😎

[@wvragtopsestep2165]

So obviously the word Chevrolet was used purposely here as if they're the only one who has powder metal rods and the only place to get a piston like this I mean this must have been an economic choice because I know there's far better stuff to spend the money on out there that doesn't have the word Chevrolet tied to it. Would really love to know the particulars and so on for the use of I'm assuming what is a LS piston and Rod.

[@trxtech3010]

lol Hand Job!

[@bobawatsit]

port volume is meaningless ( to me, you can change this variable with IN manifold shape) Most important to me is....Port diameter, top side port height, valve verses seat throat diameter, back side of IN valve shape verses chamber wall. A good port job means, knocking out valve guides, smoothing out any guide boss to match the port shape and only removing enough metal forward of the guide to the back of the IN seat to account for the valve stem volume and any new shaped bronze guide, ...Chamber shape is a whole new story

[@user-rl5nv4lw5l]

Good afternoon I am from Russia... Be a normal man include a translation of the subtitle, please..

[@spud4ever290]

Be a normal man (as opposed to being a extraordinary man)?

[@dielauwen]

40 years porting heads? Must be boring. 40 years of anything would be boring. Is that why people get divorced? Yep She is Boring.

[@marvingvx1]

I built my first flow bench in 1958!!

[@daledavies2334]

Only boring if you quit learning.

[@DodgyBrothersEngineering]

Sorry I have to unsubscribe and stop watching your channel, the back ground music and the constant unnecessary use of scrolling messages are doing my head in. Your content is great, but the video editing is too much to bare. If you get someone else to so the editing I will be back, but till then I wish you luck. Thank you for all the insights and wisdom you have given me over the years, you are a true legend.

[@marvingvx1]

Sorry about that guys. But all is not lost as I would still like to have your opinions. I am taking note here with the music although I can barley hear it on my studio setup here. None-the less -- . As for the text that is done to fill in anything I may have missed or not emphasized sufficiently. If I stop doing that I will almost certainly get ten messages asking the question I would have covered in the text messages. Tell you what guys - to make up for for this how about we work on a subject for a video between us and we get to edit it jointly. You seem like you have the where-with-alls so what can I loose? On the positive side I could well learn something - wad-du-yu say??? DV

[@DodgyBrothersEngineering]

@@marvingvx1 hi David I have said it before but I think it is worth repeating. You don't need whistles and bells when you have content worth listening to. If you were some young kid that is demonstrating the latest iPhone then whistles and bells help sell the message with some glitz. Like me you are an older guy (although you still have quite a few years on me) your voice is not as loud, or as clear as it was when you were younger (and I can guarantee you my hearing isn't getting any better with age either). This is just old age, lot of stuff is not what it once was (especially after 50), that is the privilege of old age. For your videos there needs to be ZERO music is the background, not turned down, not used in certain places, none whatsoever. It doesn't add to your videos, it takes away from them. Horses for courses you're not creating music videos you are talking about in depth technical information. Anything that makes it harder to understand what you are saying is taking away from the video. Even at very low levels the music can blend into your accent and make it harder to concentrate on what you are saying. Most of your audience doesn't have your experience and that means that we need to listen very hard to understand what you are saying, it isn't just a case of hearing what you say verbally, we also need to process that information quickly. Any form of distraction makes that job harder to really understand the full depth of what you are trying to convey is counter productive. Same goes for the scrolling text. I see something pop up on the screen and I am like a cat watching a laser pointer, my eyes are darting all over the screen trying to read what is coming up while trying to listen to what you say / process it. Large bright / multi coloured text are all distractions, and scrolling just makes it a nightmare. I use captions in my videos to add additional information, but I try where possible to put the static text in the same spot (not always possible depending on the light source) so it is one less thing to focus on, if text comes up you can expect it to be in the same spot. I try and use a smallish simple clean font, so it can be read fast. I only leave the text on the screen long enough to read, no longer, so I will read what I have typed several times in editing myself to make sure I haven't left it up there too long and avoid taking away from what I am doing. Over use of text is a really big no no. Text should only be used to correct a mistake, and not be used to explain something. If something needs to be explained further or in greater clarity, the video should be reshot, or added later on as an addendum. Using text to clarify what you meant while you are still speaking is not a good way to do it. Think of text like another person speaking at the same time. If you are talking and text is coming up, you are talking over yourself. That is why I say it should only ever be used to make corrections, or some piece of information that is absolutely vital that it be added at that moment in time. Don't be afraid to stop talking, or even stop the video completely if you need to add in text. Nothing stops you adding in a single colour screen with text on it (again words are important not a fancy background that is a distraction from reading the words), and let the video run long enough to read it at a normal reading pace then go back to you in the video. It isn't super hard to add those in editing. I totally get that sometimes things need to be elaborated on, or to clarify to avoid a lot of questions, but inserting text while speaking is not necessarily the answer. Don't be afraid to put pregnant pauses in your videos after making a statement that requires thought. Remember your audience isn't in your head or has your years of experience, we might need a bit of time to digest a complex thought. So if you think you have said something that takes some thinking about leave a few seconds before you start talking again. You have two basic types of KZbin viewers, those that are never going to watch the whole video and you will only ever have their focus for a short while, and those viewers who will watch the whole video if it is an hour long. While you are saying something meaningful the second lot of viewers are going to keep watching, so don't be afraid to give them chance to digest what you are saying. What is a complete waste of time is your intro scene. I hit the fast forward button twice (10 seconds) to skip that garbage. You don't need a count down for a video, it's not a livestream you are not waiting for it to start, the video starts the moment you hit the play button. In most case livestreams don't even need countdowns, it just comes across as a cheap and tacky way to pad out your video time (it is why a lot of KZbin content makers use them). If you want to make your videos longer, leave some pauses to digest the content, please get rid of that awful countdown intro and scrolling text. I will keep an eye out for the next few videos to see if there is any change, but until serous changes are made they are just too hard to watch regardless of how much I enjoy the content. Regards Paul.

[@alanwhite3280]

Im 66 l have no problems watching/ listening to DV's videos!!

[@DodgyBrothersEngineering]

@@alanwhite3280 and if I asked you to highlight the 10 key points of a video, could you tell me? I watch TV to be entertained, I watch experts to learn and absorb everything I can. I don't mean that to sound snarky, but not everyone is going to get the same amount of information out of a video as others, some will stare blankly at the screen and learn nothing, but they can still say they watched the video. People who actually know what they are talking about are few and far between, there is a boat load of KZbinrs who would have you believe they know what they are talking about but are full of piss and wind to impress the uneducated. If I am going to spend valuable time watching a video for learning purposes I want the best chance possible of doing that, otherwise I might as well join the brain dead and watch Cleetus McFarland and his twin turbskis with the other zombies.

[@alanwhite3280]

@@DodgyBrothersEngineering l agree with your comment to me. I do have a check down list in my head(nothing formal). At times when l decide to turn something off it seems my list does not extend beyond three: content, passion, and does it make sense.

[@boknows3841]

Blah blah blah all talk and no video. Why don't you show me 🎉pulls on the dyno

[@doxop6109]

No AFR??? What a shame.