421 SD repo intake project
 

I thought I would start a shorter thread for all the guys interested in buying a early and late style intake.
John came to my house today with a finished machined intake to test fit on my 62 389 engine.It was better than we would have even hoped for for the first machining sample.One issue we found is the casting did not allow for a blind threaded hole for the doughnut draw up bolt.That will be addressed in the casting.Another issue I forgot about is the second to the last intake bolt on the pass side(last bolt on late style)will need a threaded stud to get by the port and put a nut on.It will be furnished with every intake.The ports were better than any after market intake for matching.Will get good pics next time when we can put light in them.Pics to follow.Tom

Pics.Enjoy!

Couple more

Awesome!!

Very nice. Thank you all for all your work.

"421 SD repo intake project" Repo? Didn't you pay for it? LOL How about repro? Just kidding!

Looks great! I keep trying to find a way to justify buying one.

Great Tom and John!

Looks great!!

Looking good!!!! Thanks guys.

Fantastic progress! I can’t wait to see some of these manifolds showing up on cars. Tom, out of curiosity, how many manifolds are you planning to cast and is it a one time only run?

John has taken over the project,I believe he ordered 50 intakes.It will be up to him about the future.Tom

Tom can you put a straight edge across the carb pads and measure down to the block at the valley pan lip front and rear and I can add it to the list here. Be interesting to compare it.

I'm still in for a late model head one!!

http://forums.maxperformanceinc.com/...=Intake+height

Next time I have it back in my hands I can.Tom

Fantastic work guys. These are turning out great

Fantastic job, Tom and John. Can't wait to get my hands on one.

Curious to that info also Tom. Thanks

I cant do it on the car with carbs on.Have to wait to get my hands on the intake.

No that would be too hard easier on just a motor.

OK,brainfart!I have the 3D printed intake here!Will get at the engine ASAP.Tom

Pics of early intake on a 62 389.

Sorry guys,if someone can straighten it would be great.There could be a mm diff one way or other but going to be pretty accurate.Anyone using or trying to use Holleys will have to add the thickness of the adapters and spacers if run.EVERYONE SHOULD be aware of exactly what I went through to get large top AFBs under the hood on a 62 GP with out cutting the hood.Tom

Thanks Tom!

Turned. :D
Just got a nice 538568 ‘63 Tri Power aluminum water neck.

Thank you,a little more EZ to read.Tom

A bit easier to see, ok on the laptop, looked small on the phone unless I downloaded them, text you tomorrow Tom.


https://forums.maxperformanceinc.com...8&d=1645565852

https://forums.maxperformanceinc.com...9&d=1645565864

https://forums.maxperformanceinc.com...0&d=1645565873


Much Thanks!
Frank

Oh goody!
Now there will be more 421 Super Duty's exant than were ever made in the first place.

There already is.There were 2 batches of Bathtub intake made over the years.I would say about 50-60 already.Also the repops are better than the factorys!Tom

Not to mention all of the 54299/91, 9770319, and 9770859 intakes that were sold over the counter and which are now on who knows how many tribute cars? Not bathtubs but certainly 421SDs.

Not interested in a tribute, just wanna soak in the Tub and bask in the sunlight...


Frank

Impossible........no one is producing heads yet!

Run the 859's on both my 421sd's. But my ultimate goal is to have a bathtub and almost there. The pontiac God's are looking down. Thanks guy's

Mikes Reply: "Try to find a reason "NOT" to buy one".

(1) Mike, would like to know "How many Ponies will I get over my current HP level?

(2) Is It required to Port match my "D"- Port Heads to the Bath Tube Manifold from the start?

(3) Here is a better description of my existing set up: Since I have a 1979 TA Scoop, open toward the Windshield, over the existing Tri-Powers on top of my 1976 Formula Hood and the "Poor designer" before me, "did not" account for the forward most Carb. height (the Scoop should have been installed more forward to fit correctly) I use a small Filter on top of the forward Carb. The Center and Rear Carb. clear well. That being said, I run a 1979 Pontiac TA with the 428 HO. "Will I have any issues fitting the Air Filters, if I go with the 409 carbs"? What is the 409 Carb? "Is it an exclusive type, just for the Chevy 409"? Do I have a second practical choice to Carburation?

LOL! True!

I have a long list of reason not to. Like I have a big pile of parts to buy to get my car back together.

Mikes Reply:

Don't feel bad, I have to rebuild the TH400 on my Vehicle and I am reading all my saved files in order to accomplish this task. My roommate is doing the same thing. Soon we will watch some Videos and build our confidence up. I have the parts to rebuild it, but I am sure we will find some hard parts inside to replace. This is first in my priorities and foremost.

3783 AFBs are another good choice for carbs.Tom

Mikes reply: To Charlie Jones!
Extinct, I think you mean?

Originally Posted by JSuchma ,View Post
Impossible........no one is producing heads yet!

Mikes Reply: If you are saying "It is Impossible to buy any Trans. kit parts meaning: Seals, Bushings, Steels and Clutches you are semi-correct. However, I was turned down by two companies that sold the rebuild Trans. kits, so I jumped on the third one, that happened to be, an in-stock "B+M" kit, without the Kolene Steels nor the Torrington Bearings. I can live with the Regular Steels and I bought the Torrington Bearings else ware. I bought the extra special rear Case Bushing with Shims & Bearing, only to find that Sonnex carried a better version with a Lip to keep the Bushing from moving out toward the rear of the case. I had to purchase the Thrust washers kit else ware too and then I ordered an extra Shim kit for End-Play Tolerances, since I am" not" stocked, as a Transmission shop would be. Presently, I am learning all I can before I open the Case, the Trans. is in my shed awaiting dissection. I just hope I can get any hard parts online when it is time.


Mike here: now that I re-read your Post, the meaning went of it went over my head, with these one liners people throughout, in a split second, my bad.

How the hell did we end up on transmission parts on a thread about a bathtub intake?

Never mind…

Thank you Tom for your efforts on this!

Keep on topic guys or just start another thread already…

S.T. I have you early on the list for a late style intake!You still want one?Sent you a PM awhile back.Your number 6 on the late list.Tom

You betcha I do!!

Mike here: I would like to add something to the Tunnel Ram Project. Since I have had my Tri-Power Rochester Carbs. apart half a dozen times in 10 years to ensure good performance and all the factory parts are present, I have noticed that the Main Well Tubes use Main Well Inserts over them. For those that are not familiar let me explain. The Main Well Inserts use holes in them to break down the fuel in order to quickly Atomize the Fuel Prior to entering the Venturi's. Thus, Atomization begins in the Main Well area, just as digestion starts in the mouth through saliva.

Let's look at the Tunnel Ram being produced by Tom and others. I Propose, an additional Atomization event be Included. Since you are making the Tunnel Ram even "gooder", then the Factory why not improve it on the Molecular level. My idea is simply to consider the upside-down "V" inner peak of the Tunnel Ram as the Roof of a home. The Peak would be the Ridge and the sides are the slope seen as Rise over run. The Rectangular Roof area is the Roof.


(1) Make the Rectangular area into the "Turtle" effect, designed to spread Fuel and sold on the market today. For example, to get this same effect, one could do it in several ways. (A) Make the Rectangular service as rough as you can to spread the Fuel and get Atomized into Fumes. (B) I would Imagine that the first Billet Tunnel Ram will be used as the "Plug" in Creating the Mold in the evolution of the Tunnel Ram to Fruition? When the Cast process is being instituted one could spray contact cement on both sides of a piece of very course Grinder sand paper and adhere that to the rectangular surface of the Roof. With that in the negative built into the mold would act as the Atomizer I propose.

(C) Now over and above that I propose that an additional and separate modification be instituted for even more Atomization. Build an upside down "V" out of Metal with holes in it by bending a replica of the Tunnel Rams peak roof, but say one inch over the peak in design. Stand off the unit, by threading, tapping a one-inch standoff rod, located were needed. The second Roof acts as the Main Well Inserts previously described. Make various holes in different diameters.

Make some holes by drilling through and leave them with sharp edges but wet sanded with mineral oil to de-bevel them. Other holes can de counter sunk, but still de-burred. I figure Fuel will run off the flat surface of the Metal plate then across the sharp edges of the rough holes. I figure the holes with the counter sunk edges will drop one inch and Atomize on the way down. The various size holes are experimental in that one could drop Mineral spirits over the plate at the height of the Throttle plates to see which hole works best.

Another ploy might be to build in a positive and negative dimple effect into the Roof surface of the upside down "V" first instead of the sand paper effect or use both simultaneously. The focus here is to get the Fuel Atomized best you can before it enters the Tunnel. The Tunnel must be addressed at this time, only the bottom I presume is necessary. I would roughen up that surface using the same methodology as stated before.

Now, of course some of you racing car people have already thought of some of these ideas, I am sure. Why not Incorporate these ideas into the mold while you can? The Metal plate with holes in it can be an option, as well as the rough surface, people can pay for the price of the upgrade if they want it.

P.S. Name the Tunnel Ram Project as: Adam, why? The acronym: "Atomization-Done-At-Molecular Level". Plus, Adam depicts the beginning of something, in this case Fuel going from a liquid to a gas. Mikes two cents.

Mike,NOT needed in this thread!Tom

Guys,have not got anything more from Lynwood.John and I are on them to get us info when we will have another couple intakes to machine and test fit.Standing by.Tom

Question: Are you guys waiting for a few more of the early version or are you waiting for the first of the late model castings? Just curious.

We have a early machine sample,needed a couple small change in the pattern.Waiting for a update machine sample and a machine sample of the late with the pattern changes.

Got a email that the late intake will be poured this week,hope to get it machined and test fit by maybe next weekend!Tom

Thank you for all your efforts.

Looking forward to seeing the finished castings for the late model intakes.

Tom V.

Guys in sorry I dont have any new news!I was gone this last week,have not got word on the last promise that did not happen.Im here this week and then off to FLA for a week.Hope to have some good news before I leave.Tom

Going fishing in FLA?