David Vizard's Mission Impossible project 318 heads vs 340 z heads vs. 360 j heads!!!

Rob stopped by with a 340 z head and we do some comparing of a almost stock 340 z to old J flows vs. the Mission Impossible 675 head casting! Fun and interesting!

[@Patrick-xd8jv]

The X heads on my 70 340 after pocket porting were around 240 without touching the runners. Those z heads have been opened up a bunch on the exhaust. I have to admit that I have never seen a Z head with a 915 casting number. Must have been a 71 🤷🏼‍♂️. This is really showing how well you have the 318 heads working. I am betting that you will get 245-250 without epoxy

[@ROBERTBORGESON]

Thanks Fella's looking forward to some porting results on the Z with that 2.02 valve.

[@paintnamer6403]

I think these videos are really informative. I wonder how all the heads I ported would flow, a lot of basic port matching and bowl work and then a valve lap job. My friends liked the price.

[@fastinradfordable]

Same here. I did a lot of things they say never to do But damn it’s one of the best running engines I’ve ever worked with and I’m a full time mechanic - it’s in my daily

[@servediocylinderheads]

I think I know what you are writing. Take a look how super stock heads are done with tiny pinches and big bowls that make crazy hp on a specific amount of port volume.

[@kd6tas]

I want one of those thermoquad shirts.

[@servediocylinderheads]

Gq looked good in it!

[@jim55282]

Numbers X,J,O & Z ?😊

[@fastinradfordable]

😂

[@Robs-Garage-experiments]

Whoops! I laughed when I seen the video and said the same thing to myself. LMAO! Letters Rob LETTERS!

[@jim55282]

@@Robs-Garage-experiments all good, I laughed too, we all mess up sometimes.

[@slackthompson6984]

like Elvira used to say at her live shows " welcome to my big opening"

[@jeremylastname873]

I love the shirt! 😎

[@CrazyTony65]

4/3 Pie r cubed, volume of a sphere.

[@JohnClutch1]

Off the top of my head at 1" diameter, I believe the clay ball is 0.785 ci

[@servediocylinderheads]

That does sound about right.

[@servediocylinderheads]

Now convert it to cc.

[@yeehaw3792]

​@@servediocylinderheadsAny updates on this project???

[@servediocylinderheads]

@@yeehaw3792 I did three intakes and almst done with the open chamber heads with stock valve sizes. Thanks

[@brokentoolgarage]

Nice! I never heard of "Z" heads.

[@servediocylinderheads]

Me neither!

[@MidnightOilsRestoration]

Good side by side comparison guys, thanks for the Father's Day entertainment, I hope you are both able to enjoy yours 😊

[@servediocylinderheads]

Thanks Ryan.

[@Robs-Garage-experiments]

Thanks my man. It was a good start of the day hanging out with Charlie with the second half at home resting and enjoying.

[@MidnightOilsRestoration]

@@Robs-Garage-experiments that's where it's at! Some r&r is nice when you can get it

[@Jim-ic2of]

Rock it Rob !😊

[@joejohnson4868]

I believe the bump you are referring to on the roof of the intake port is for material thickness for the head bolt counterbore. We use to make a plug to fill the counterbore and remove the bump. Didn't have a flow bench back in the day. It would be interesting to see if it improved the flow.

[@servediocylinderheads]

I did that experiment on the J heads. It helps but not that much. Thanks

[@joejohnson4868]

Do recall any numbers on flow and swirl?

[@Jim-ic2of]

Rob is a musician huh ?😊

[@servediocylinderheads]

What would make you write that?

[@Jim-ic2of]

@@servediocylinderheads Very suave and confident when he said "Take it away Charles . " Or something to that effect .

[@ferdinandcuevas8457]

Question wouldn't raising the floor increase the volosity of the port ?

[@servediocylinderheads]

You bet.

[@voodoochild661]

It was uncle Tony’s 318 project when was it hijacked?

[@servediocylinderheads]

Hijacked? Sure, if you say so. I would love to see others do the same project and compare results....

[@hunnybunnysheavymetalmusic6542]

Increased velocity directed to a new location?

[@servediocylinderheads]

Moved the air up to roof more.

[@hunnybunnysheavymetalmusic6542]

@@servediocylinderheads Still trying very hard to understand reciprocating engines. Built them, raced them, even slightly power built them, but never really studied things like swirl, deflection angles, inlet velocities, etc. When I went into the USAF, I focused solely on turbojet engines. Completely different set of laws and principles from reciprocating engines.

[@servediocylinderheads]

@@hunnybunnysheavymetalmusic6542 Excellent.

[@tomsettles6873]

Did Vizard finish this engine? It disappeared off his youtube 5 months ago.

[@servediocylinderheads]

He can't, I need to drop off the heads and intakes. Hopefully January. Thanks

[@mikegreer9041]

I love old engines as i have a few. But with the gen 3 hemi, to me, why waste the time .

[@servediocylinderheads]

300 cfm stock

[@Robs-Garage-experiments]

Because we’re old farts playing with the things we grew up with and have a stock pile of parts for. We are very familiar.with these old engines and they’re also very easy to mess around with. They don’t need a computer to work, we do t need a scanner to figure out what’s wrong, simple, relatively inexpensive and readily available parts. No learning curve to contend with. There are short comings of course but we are not worried about it. The current second generation of true muscle cars are awesome. The advantages they have over the older engines are numerous and amazing. There are way more advantages over the 1st wave of muscle cars than the first muscle engines than the average engine back in the day. Current muscle engines are a little more money and worth it. If you have the coin to drop on them, there great.

[@hunnybunnysheavymetalmusic6542]

5:00 Are you saying the air is colliding with that area and its choking the flow?

[@servediocylinderheads]

No. Too much area and too slow an air speed. Does nothing but hurt port energy and cylinder fill.

[@hunnybunnysheavymetalmusic6542]

@@servediocylinderheads I confess, even with all of the years of aerodynamic studies I had with turbine engines, airfoils and slip stream stabilities, there is still a whole lot I do not fully understand. It seems to me, by my experience with supersonic and hypersonic air choke fields, that speeding up air tends to make mach waves that cause stall. And yet here, it seems the opposite is desired, where one is pinching back the air flow, to raise air flow velocities to increase power. Pretty much why I never messed a lot with head porting or bowl shaping. I probably would have done it all wrong, based on the principles I used when building turbojet engines. ~( ,m,)~

[@tysdrift2404]

When the exhaust Port does not match the header do you blend them together like a D shape port into a circle shape header?

[@servediocylinderheads]

I don't like to match exhaust. I like an anti reversion ledge. Head is smaller than header.

[@tysdrift2404]

@@servediocylinderheads thank you I appreciate you answering my question

[@servediocylinderheads]

@@tysdrift2404 No problem

[@hunnybunnysheavymetalmusic6542]

Z heads... Hmmm....

[@fastinradfordable]

I had a 71 valiant 318 4door. And once lined up against a 1974 340 Duster. And spanked him to 50mph

[@wayne8498]

No 340s in 74

[@Robs-Garage-experiments]

Now that doesn’t mean the low compression 360 was replaced ….. LOL. It was the thing to do.

[@approachingtarget.4503]

If you can find them. The factory also offered 2 more sb heads in the X,Z castings. The X casting for Mark Williams trans am team and the T/A AAR Cuda heads. The x casting has the best exhaust port available. The T/A head had no push rod pinch. They only made 500 pairs of each of these to be legal for factory racing.

[@servediocylinderheads]

Good info. Thanks

[@servediocylinderheads]

What were they thinking on that floor? Horrible.

[@stephenwest798]

The T/A had the offset rockers and relocated pushrod holes, but you had to remove the pinch yourself as the factory did not. Same ports as the other J-heads.

[@superkillr]

Any chance of cleaning that garage?

[@servediocylinderheads]

No

[@jackwillson8099]

I build up the floor ,pick up the fps & start too lose CFM then i call it a day

[@servediocylinderheads]

This is the best way?

[@jackwillson8099]

@servediocylinderheads how MR .Vizard doing & how are you doing with the 318 low budget build with uncle Tony Garage

[@servediocylinderheads]

@@jackwillson8099 All good, just finishing a few projects and then I will drive up to him and deliver it all.

[@jackwillson8099]

@servediocylinderheads that what I do with heads , you know you try to push the cfm up max then you fps goes to shit lose all the air speed , once my fps drop off 40 too 60 fps then I know too stop , that about the best cfm you can get at half lift & full lift , then I'll fill it up to get the fps back & I'll lost a little cfm , and the port is Quiet through the lift curve I know I got a winner

[@jackwillson8099]

@servediocylinderheads cool you guys are awesome , looking forward too see how much power it makes

[@tomconte1765]

Aaaaaaannnd. Begin!

[@servediocylinderheads]

What are we begining?

[@jonathoncouchey7151]

Now I know why those exhaust were so dead. 😂😂😂 they opened the exhaust openings. 🤦‍♂️

[@servediocylinderheads]

It sure didn't help!!

[@hunnybunnysheavymetalmusic6542]

Casting flashing...

[@MrKawa74]

Do You get "Equal" Flow from "Entire Valve , 360*" ? If "Swirl Exist", wouldn't Blue be All around Valve 360* ? Which is Shortest a "Straight Line Flow or Swirl Curved Flow ? 4 Strokes= Intake Down -Compress Up -Power Down-Exhaust Up , = 2 full Crank Rev's, At 6,000 rpm , =100 per Rev= 100/ 2= 50 times per Second for 1 REV = 2 Strokes per Rev = .02 / 2= .01 per Intake Stroke ?

[@servediocylinderheads]

The dykem is way heavier than fuel so if you get a wide spread on dykem fuel will be way better.

[@Robs-Garage-experiments]

MrKawa74; Good question. Consider that the draw from the machine is more than what the engine will see under a cruise rpm on the street. The amount of blue dykem you see is as Charlie said, is heavier with less of tumbling and more of a straight run, the lighter fuel will swirl around because it is lighter. Under the cruise and part throttle applications of normal driving, there is also a more atomized fuel mixture running the entire intake track from carb to valve and not the heavier spray from the aerosol can of the dykem a few inches from the port. Do so remember that when we tested, the room temp was in the low 80’s and a running engine Willy warmed up is probably at least double that number at 160* for a race engine, 180/190 or better for a stock engine. This means the relatively cool daikon is a denser fluid versus the lighter, warmer and more evaporated gasoline that will have the propensity to be in a more gaseous form conforming to running around with the air in a more highly mixed state vs the dykem. Between the 28” draw of the machine and the dykem, it becomes more representative of a heavy pedal & acceleration representation and what you would need to know for what the head is doing under the wide open throttle condition. IIRC, the valve was opened up pretty good. I don’t remember if it was .600 or not. Since the head is now a little ported and flows very well at such lifts, this is where you would test it, and spray the dykem and see what’s going on. Yes, if you lifted the valve to only.444 like a stock cam does or less depending on your lift & matched what a running engine would see in terms of vacuum, the pattern would be different. It we don’t port heads and test low lift figures at part throttle, the pattern would show much differently. The factory engineers might do such things as well as other tests like for the things the government mandates, emissions, fuel efficiency for mileage. There thought patterns and tests are of a different mind set & meeting different criteria. Again, good question!

[@MrKawa74]

I was Told by "goneracing", [ V Gains, Crew Chief ] Pro Stocks Pump Ice Water into Engine Block, Leave Starting Line 60*ish to Finish Line 110* ish? Cooler A- the Denser? How many Degrees is cam at Top Lift , .600", .444 ? ....1 Degree,!.... Flow on the Flanks 2 Times,..... going Up and going Down Lobe..... ! Flow on Flanks of Cam is More Flow Under the Curve ! Have you Tried a U Pitot Tube to ...Measure -Map.... Pressures in Port , In-Out, Up-Down-Center , find the High & Low Presures and Dead Pressure Areas .....Need Filling....Equalising Pressures Have you tried Dykem thru a Intake Manifold bolted to Head , thru Carb Opning, Misting from 2' back , Maybe turning 90* ccorners would only carry Light Particles, Mist ?

[@servediocylinderheads]

​@@Robs-Garage-experimentsGood points Rob!

[@servediocylinderheads]

​@@MrKawa74All air speeds are from Pitot.

[@jonathoncouchey7151]

Charlie, would you be interested in messing around with some 4 valve heads one day? Not anytime soon because I currently have other financial commitments. But just curious. The application would be the 3.6 pentastar so we are limited to .400 max lift and the exhaust manifold is cast into the head.

[@servediocylinderheads]

I have a set coming...stay tuned!

[@hunnybunnysheavymetalmusic6542]

SQUEEZY!!!

[@servediocylinderheads]

Whatever that means?

[@hunnybunnysheavymetalmusic6542]

@@servediocylinderheads Nothing in particular... Just looking at the areas where the air is flowing in the intake port... I am likely wrong, but my mind sees it as 'pinched'. You may see it as 'accelerated'... I profess ignorance on this.

[@Jim-ic2of]

I heard a sex change surgeon say "It's easier to make a hole than a pole !😊

[@servediocylinderheads]

You would know.

[@Jim-ic2of]

@@servediocylinderheads Hey ! That's what the Doc Said !😆

[@TheProchargedmopar]

Very Cool 👍💪

[@servediocylinderheads]

Glad you like it! Thanks