SBC Intake Manifolds: Creating Another List.

[Lloyd klem]

We have worked over dual planes hard.Have added material to bottom of intake runners to get area.We did a killer one once when rules allow work but manifold had to have cast number on it to prove what it was.

[Lloyd klem]

I had brought this intake out on a different thread.


9901-101.jpg


https://www.holley.com/products/engine/ ... 9901-101-1



Intake 1.jpg



Intake 2.jpg



Intake 3.jpg



Intake 4.jpg



Intake 5.jpg



Some good commentary followed.

viewtopic.php?f=1&t=65362&start=15

Not enough area in that Holley to interest me.If I had to run it ,most likely take 80 hrs to fix it.

[Lloyd klem]

That's what I was thinking too. Looks like there's a fair bit of gain there.

imo you can't get that manifold to big without ,cutting and welding on 430 plus engine.4.00" stroke is BBC territory.Look at area that comes in small BBC intakes.If 7000 rpm is peak goal then maybe that manifold could cut it maxed out.I always have been greedy and want more..

Depends on the combo. Just did a back to back on a pump gas 436 that made 770hp. The medium size intake made the most tq, peak HP, average TQ and carried higher than the biggest intake.

Not trying to argue with your results.I just always want more rpm and area than is available.I rarely build a 23 deg engine over 415 inch because I rather have rpm in less inch than bigger engine and torque.Small tire and big torque are hard to get down the track.7500 rpm and below engines just don't peak my interest.The old saying rpm is king is why I mess with this stuff.

[af2]

Thanks for that Scott.
But don't limit yourself to "my combo".
It may be that it'll change.
What you've got going on with own your stuff I find very interesting.

Thank you. My top choices for standard port, single plane manifolds include...

•Edelbrock SV2 2892
•AFR Eliminator 4811PM
•Pro-Filer Wilson
•Holley Keith Dorton 300-110

Honorable mention...
•Weiand Team G 7531
This one is best suited for smaller displacements, and is a heavy casting.

And more.. The Motown I ran had a clover leaf problem having the 4 center plugs always lean and jetting to try and band aid the problem never worked. Finally I was done and pulled it and fixed it! No more clover and the center dividers cut down as close to the same entry as the out side runners. First time out all the plugs were the same and went .2 faster and 5 mph. Later had Mark build me the Methanol Carb and went another .5 and 8 mph faster. 9.46 @ 146. There is a lot in an intake that you cant get by buying store bought and need to fix things.

[ChopperScott]

I’m curious about the clover leaf design and wanted to try it. I’m currently running the Edelbrock SV2 with a Wilson Manifolds tapered spacer on the 434…

DF45F04C-FDBE-421B-A142-4594D0CA1AE5.jpeg

49689B2B-77AF-4842-BD22-9BCF7CC20B8D.jpeg

[af2]

I’m curious about the clover leaf design and wanted to try it. I’m currently running the Edelbrock SV2 with a Wilson Manifolds tapered spacer on the 434…

DF45F04C-FDBE-421B-A142-4594D0CA1AE5.jpeg

49689B2B-77AF-4842-BD22-9BCF7CC20B8D.jpeg

Just my thought is the fact you need more plenum first on the 434. The picture I showed was on my 377 that shifted at 8500 and saw north if 9000 a few times.

[ChopperScott]

Just my thought is the fact you need more plenum first on the 434. The picture I showed was on my 377 that shifted at 8500 and saw north if 9000 a few times.

I'm in the planning process of another build. That AFR manifold is to be paired with a set of AFR 220 comp heads. Short block to be determined. I was originally thinking a high compression 406. I'm now leaning towards a flat top piston 421.

[1980RS]

I’m curious about the clover leaf design and wanted to try it. I’m currently running the Edelbrock SV2 with a Wilson Manifolds tapered spacer on the 434…

DF45F04C-FDBE-421B-A142-4594D0CA1AE5.jpeg

49689B2B-77AF-4842-BD22-9BCF7CC20B8D.jpeg

You running the S/V II gives me hope that the intake will perform pretty well on my 406 next year. You ran pretty respectable with your 434 combo.

[ChopperScott]

The Team G 7531 could benefit from losing a little weight..

DCADB9A6-0642-44B2-AA4F-F25AFCA325FC.jpeg

3460A668-FAA9-4C22-A20D-80AEBC38DE0C.jpeg

9DE2FC6D-4C0B-48EC-8924-3591099A2835.jpeg

[af2]

You have some work to do in the center...

[steve cowan]

The Team G 7531 could benefit from losing a little weight..

DCADB9A6-0642-44B2-AA4F-F25AFCA325FC.jpeg

3460A668-FAA9-4C22-A20D-80AEBC38DE0C.jpeg

9DE2FC6D-4C0B-48EC-8924-3591099A2835.jpeg

As I mentioned I have the same intake.
I have not looked hard but the problem you might run into is when you open runner entry and try and lay it back towards carb pad I recon you would break through roof of runner.
The smaller cube stuff lower rpm you would get enough area but not for your application.
All these 4150 manifolds
Victor junior
300-25
Team G stuff
Super victor etc,etc
Have the same carb pad dimensions.
My opinion and I am far from an expert on anything but to get the area at the manifold opening and the desired shape the carb pad will need to be opened up.
Even on the Big Mother Trickflow
Intake the carb pad is standard dimensions.

[Bigchief632]

imo you can't get that manifold to big without ,cutting and welding on 430 plus engine.4.00" stroke is BBC territory.Look at area that comes in small BBC intakes.If 7000 rpm is peak goal then maybe that manifold could cut it maxed out.I always have been greedy and want more..

Depends on the combo. Just did a back to back on a pump gas 436 that made 770hp. The medium size intake made the most tq, peak HP, average TQ and carried higher than the biggest intake.

Not trying to argue with your results.I just always want more rpm and area than is available.I rarely build a 23 deg engine over 415 inch because I rather have rpm in less inch than bigger engine and torque.Small tire and big torque are hard to get down the track.7500 rpm and below engines just don't peak my interest.The old saying rpm is king is why I mess with this stuff.

Yeah, I understand. This combo had a max rpm limit for peak hp rpm. The goal wasn't to make as much as possible with no rpm limit. If it was set up to peak higher, the bigger manifold would have been better at higher rpm more than likely above 7500

[ChopperScott]

I’ll be on that Team G after I’m finished with this turd…

7B360732-8042-494E-821D-71A56324C788.jpeg

854A3A97-372A-405B-B603-BFEFD7BB2AF7.jpeg

[ChopperScott]

Finished…

20E90CD7-0285-4737-AA85-3D5B980FD84A.jpeg

C7C2031D-9BA5-4669-84A2-AF050CDB4935.jpeg

[steve cowan]

Finished…

20E90CD7-0285-4737-AA85-3D5B980FD84A.jpeg

C7C2031D-9BA5-4669-84A2-AF050CDB4935.jpeg

Looks good Scott,
How much taper do you work on for your application.
On my 383 engines that turn around 7000rpm I look at approx 3/4"