AFR Eliminator Race Intake Manifold for SBC

[steve cowan]

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If I had that Eliminator manifold I would ELIMINATE the carb pad and runner extensions would be thinned down to get the area required for the engine/ application. Nice looking intake, reminds me of a SV from the outside.

[ChopperScott]

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B65541C4-6443-46CB-9BDE-BBDC8C87AE94.jpeg

F1E60A47-1F47-4149-9650-8D1544B8E3BE.jpeg

79108FB4-4B96-4C98-93B9-73DE16ACCD76.jpeg

If I had that Eliminator manifold I would ELIMINATE the carb pad and runner extensions would be thinned down to get the area required for the engine/ application. Nice looking intake, reminds me of a SV from the outside.

I certainly don't have your skills in that department. Maybe I'll butcher one of my old Weiand intakes for practice... 7531, 7546, 8004, or 8016.

[HQM383]

0E455E98-44E4-4538-98FE-41912F53244A.jpeg

B65541C4-6443-46CB-9BDE-BBDC8C87AE94.jpeg

F1E60A47-1F47-4149-9650-8D1544B8E3BE.jpeg

79108FB4-4B96-4C98-93B9-73DE16ACCD76.jpeg

If I had that Eliminator manifold I would ELIMINATE the carb pad and runner extensions would be thinned down to get the area required for the engine/ application. Nice looking intake, reminds me of a SV from the outside.

Steve,
What findings in testing would warrant AFR and other manifold manufacturers to put the cloverleaf and extended runners in their manifolds with this level of intended use? If they don’t put that extra material there they could be saving a buck.

[steve cowan]

0E455E98-44E4-4538-98FE-41912F53244A.jpeg

B65541C4-6443-46CB-9BDE-BBDC8C87AE94.jpeg

F1E60A47-1F47-4149-9650-8D1544B8E3BE.jpeg

79108FB4-4B96-4C98-93B9-73DE16ACCD76.jpeg

If I had that Eliminator manifold I would ELIMINATE the carb pad and runner extensions would be thinned down to get the area required for the engine/ application. Nice looking intake, reminds me of a SV from the outside.

Steve,
What findings in testing would warrant AFR and other manifold manufacturers to put the cloverleaf and extended runners in their manifolds with this level of intended use? If they don’t put that extra material there they could be saving a buck.

I can't say why the clover leaf is cast in and what it is supposed to do but my opinion is -
The extended runners are a good thing as it saves you welding.
I believe the plenum size and height helps dictate rpm if runners are sized According to application.
Anything I see that runs good has open plenum and shear plate or some form of mis - matched spacer to help with the reversion pulse on butterflies.
Again opinions may vary.

[ChopperScott]

AFR makes a matched spacer for this manifold…

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[MadmanMark]

Here's how mine end up

[HQM383]

If I had that Eliminator manifold I would ELIMINATE the carb pad and runner extensions would be thinned down to get the area required for the engine/ application. Nice looking intake, reminds me of a SV from the outside.

Steve,
What findings in testing would warrant AFR and other manifold manufacturers to put the cloverleaf and extended runners in their manifolds with this level of intended use? If they don’t put that extra material there they could be saving a buck.

I can't say why the clover leaf is cast in and what it is supposed to do but my opinion is -
The extended runners are a good thing as it saves you welding.
I believe the plenum size and height helps dictate rpm if runners are sized According to application.
Anything I see that runs good has open plenum and shear plate or some form of mis - matched spacer to help with the reversion pulse on butterflies.
Again opinions may vary.

From a carburetor perspective the cloverleaf may be attempting to deal with the areas between throttle bores that can cause vortices. So maybe for a cleaner carb signal. Dividers, I can only imagine looking for length. I’m a believer that with each individual cylinder stroke the air/fuel filling that cylinder is coming from the manifold plenum and other runners. The carb is a restriction even at WOT v what’s already present in the manifold. So with the fill of each stroke the fuel destined for that cylinder is coming from wherever the straightest, easiest path is and not necessarily navigating corners directly from venturi to intake valve. The carburetor refills the manifold.

So while a lot of people have gains cutting back or altering other ways I’m interested how some are so long due to the manufacturers development and some way back with their development. It’s an “it depends answer” but on what?

Maybe Schmittmotorworks can chime in and tell us. Correct me on my wild theory above too.

[steve cowan]

Steve,
What findings in testing would warrant AFR and other manifold manufacturers to put the cloverleaf and extended runners in their manifolds with this level of intended use? If they don’t put that extra material there they could be saving a buck.

I can't say why the clover leaf is cast in and what it is supposed to do but my opinion is -
The extended runners are a good thing as it saves you welding.
I believe the plenum size and height helps dictate rpm if runners are sized According to application.
Anything I see that runs good has open plenum and shear plate or some form of mis - matched spacer to help with the reversion pulse on butterflies.
Again opinions may vary.

From a carburetor perspective the cloverleaf may be attempting to deal with the areas between throttle bores that can cause vortices. So maybe for a cleaner carb signal. Dividers, I can only imagine looking for length. I’m a believer that with each individual cylinder stroke the air/fuel filling that cylinder is coming from the manifold plenum and other runners. The carb is a restriction even at WOT v what’s already present in the manifold. So with the fill of each stroke the fuel destined for that cylinder is coming from wherever the straightest, easiest path is and not necessarily navigating corners directly from venturi to intake valve. The carburetor refills the manifold.

So while a lot of people have gains cutting back or altering other ways I’m interested how some are so long due to the manufacturers development and some way back with their development. It’s an “it depends answer” but on what?

Maybe Schmittmotorworks can chime in and tell us. Correct me on my wild theory above too.

The clover leaf deal might of been the next big thing in the day but I heard Darin Morgan say they mill that out including the runner extensions and re- do the whole plenum arrangement again.

[HQM383]

I can't say why the clover leaf is cast in and what it is supposed to do but my opinion is -
The extended runners are a good thing as it saves you welding.
I believe the plenum size and height helps dictate rpm if runners are sized According to application.
Anything I see that runs good has open plenum and shear plate or some form of mis - matched spacer to help with the reversion pulse on butterflies.
Again opinions may vary.

From a carburetor perspective the cloverleaf may be attempting to deal with the areas between throttle bores that can cause vortices. So maybe for a cleaner carb signal. Dividers, I can only imagine looking for length. I’m a believer that with each individual cylinder stroke the air/fuel filling that cylinder is coming from the manifold plenum and other runners. The carb is a restriction even at WOT v what’s already present in the manifold. So with the fill of each stroke the fuel destined for that cylinder is coming from wherever the straightest, easiest path is and not necessarily navigating corners directly from venturi to intake valve. The carburetor refills the manifold.

So while a lot of people have gains cutting back or altering other ways I’m interested how some are so long due to the manufacturers development and some way back with their development. It’s an “it depends answer” but on what?

Maybe Schmittmotorworks can chime in and tell us. Correct me on my wild theory above too.

The clover leaf deal might of been the next big thing in the day but I heard Darin Morgan say they mill that out including the runner extensions and re- do the whole plenum arrangement again.

Same. I remember on a podcast I think he was saying the runners don’t need to be in the plenum, get them back out of there and similar to the cloverleaf. But I’m also mindful when listening to him he quite often lives in the 8000 rpm plus world. Brilliant information but constant “does that apply to me?”

Do you recall, as I don’t if he was talking specifically about the sub 7000 rpm guy?

[steve cowan]

0E455E98-44E4-4538-98FE-41912F53244A.jpeg

B65541C4-6443-46CB-9BDE-BBDC8C87AE94.jpeg

F1E60A47-1F47-4149-9650-8D1544B8E3BE.jpeg

79108FB4-4B96-4C98-93B9-73DE16ACCD76.jpeg

Scott,
Have you used that intake or know anyone that has ?

[steve cowan]

From a carburetor perspective the cloverleaf may be attempting to deal with the areas between throttle bores that can cause vortices. So maybe for a cleaner carb signal. Dividers, I can only imagine looking for length. I’m a believer that with each individual cylinder stroke the air/fuel filling that cylinder is coming from the manifold plenum and other runners. The carb is a restriction even at WOT v what’s already present in the manifold. So with the fill of each stroke the fuel destined for that cylinder is coming from wherever the straightest, easiest path is and not necessarily navigating corners directly from venturi to intake valve. The carburetor refills the manifold.

So while a lot of people have gains cutting back or altering other ways I’m interested how some are so long due to the manufacturers development and some way back with their development. It’s an “it depends answer” but on what?

Maybe Schmittmotorworks can chime in and tell us. Correct me on my wild theory above too.

The clover leaf deal might of been the next big thing in the day but I heard Darin Morgan say they mill that out including the runner extensions and re- do the whole plenum arrangement again.

Same. I remember on a podcast I think he was saying the runners don’t need to be in the plenum, get them back out of there and similar to the cloverleaf. But I’m also mindful when listening to him he quite often lives in the 8000 rpm plus world. Brilliant information but constant “does that apply to me?”

Do you recall, as I don’t if he was talking specifically about the sub 7000 rpm guy?

I remember he was on drag boss when he mentioned that,I think it was conversation he had with T bishoff at the time.
I agree that what the people at DM level are not doing alot of stuff at our level,don't take everything they say as gospel for our junkers

[ChopperScott]

Scott,
Have you used that intake or know anyone that has ?

Eric Weingartner got his hands on a 4811…

https://youtu.be/lhKskMAO-wQ


I haven’t used it yet, but thought I’d give it a try. I’m piecing parts together for the next build…

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[ChopperScott]

AFR 6901 intake gasket on the 4811PM manifold and 1110 220 comp ported heads…

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[1980RS]

I am going to test my S/V II intake next year on my 406 vs the 300-25 I have on the engine now. Best pass was a 10.65@124mph with the 300-25, but with some other new stuff on the car I hope to see 10.40's that would make my day with the junk I run

[steve cowan]

I am going to test my S/V II intake next year on my 406 vs the 300-25 I have on the engine now. Best pass was a 10.65@124mph with the 300-25, but with some other new stuff on the car I hope to see 10.40's that would make my day with the junk I run

Looks like next year will be interesting then.
I have Dart block out at the moment, bigger cam,shaft rockers, smaller valve spring package.re- dyno
Then maybe more head work,new ported trickflow intake manifold. I am aiming for 10.0s @ 3600 pounds