AFR 210cc SBC Eliminator ported numbers update

[WeingartnerRacing]

I just finished porting one head. They are the part #1054 AFR 210cc eliminator sbc heads. They were flowed on a 4.155 bore. Here are the before and after numbers.

Intake
Stock Ported
.1-70 67
.2-133 144
.3-192 199
.4-245 249
.5-278 283
.6-296 316
.7-277 340
.8-277 324
.9-277 322


Exhaust
Stock Ported
.1-55 56
.2-118 114
.3-167 157
.4-205 201
.5-219 223
.6-224 229
.7-226 231
.8-225 231
.9-224 229

Here is a rundown of my thoughts and what I did.
-Cut intake valve job to 2.10 valve size and used 50 degree valve job
-The vane was lessened but not taken out and it tricked the numbers higher. The sizes of this port should have made it flow around 325cfm not 340. I am curious if this actually makes more power with the vane like this or how it normally is.
-Exhaust valve job was 45degree. I opened up the throat and that killed low lift numbers at the expense of high lift flow.

[midnightbluS10]

Any pics you'd care to share? Curious about the vane. Thanks.

[WeingartnerRacing]

If I could figure out how to post pics I would do it.

[F-BIRD'88]

You can maje good use of. Irfanview to get your pictures from your camera resized and corrected and in a friendly format (jpg) for posting online. The raw pictures are way to big file size. 640x480 is plenty big about 100kb ish file size. You can correct for exposure sharpn!ss etc etc.
Swiss army knife, small ,free download.

[BradH]

Thoughts as to why such a significant spike in the intake flow from .600 to .700, only for it to drop off almost as much by .800?

[KnightEngines]

Brad - they do that.

Eric kept the short turn stable higher in the lift, you can see above .600" the stock port backed up, Eric has them stable out to .700", then they back up a bit.
If he got them stable out to .800-.850" the flow at .700" would drop probably 20cfm - backing up above .700" shows the short turn is fast & just hanging on, he's got the port moving more air than the turns can handle above .700".

It's a nice improvement, will show significant gains compared to the stock head on the motor.

[treyrags]

Have you checked the CSA after porting?

[mag2555]

I don't like that low lift flow loss on that ported Exh .
Is the Exh valve back cut?

[WeingartnerRacing]

I don’t care if it lost low lift flow it makes more power with the larger throat like this and it helps reversion. It has no back cut nor do I put back cuts on the exhaust anymore.

[WeingartnerRacing]

Have you checked the CSA after porting?

Yes minimum csa went from 2.38 to 2.50. This head should have moved mid 320s not 340. I’m confident if I made the wing like normal ones it would have flowed 320s and not backed up. The wing tricks the air.

[steve cowan]

Eric,
Thanks for sharing your results, in my opinion it shows again that no matter what logo these medium sized 23 degree heads all seem to have turbulence around that 600" lift range. With that csa at the pinch they would work well on a 421-434 sbc at 6000-6500 rpm.
ERIC,
Are your exhaust throat % above 90%??
I understand if you don't want to share that one, just curious as I am trying to figure out apart from the reversion side of the equation, would it help velocity through the exhaust port so you don't have to oversize the flange area bigger than required and or does it help with overscavanging problems at higher rpm,just thinking out loud hear,
Anyway anything else you can share is a bonus, thanks

[steve316]

If you flowed that head with intake manifold it would peal off enough air flow the port wouldn't back up at all. Great job

[CGT]

The question is, is the larger throat really a flow loss......dynamically? I mean, the bench is a horrible representation of what's really going on there. And larger throats and steeper valve seats on the exhaust side is where things seem to be heading. Chasing low lift flow(especially) on the exhaust...on a flowbench seems to be indicative of a general lack of understanding of the ICE.

[WeingartnerRacing]

If you flowed that head with intake manifold it would peal off enough air flow the port wouldn't back up at all. Great job

I may do that. The manifold that goes with this head is a dart 4150 style.

[WeingartnerRacing]

Eric,
Thanks for sharing your results, in my opinion it shows again that no matter what logo these medium sized 23 degree heads all seem to have turbulence around that 600" lift range. With that csa at the pinch they would work well on a 421-434 sbc at 6000-6500 rpm.
ERIC,
Are your exhaust throat % above 90%??
I understand if you don't want to share that one, just curious as I am trying to figure out apart from the reversion side of the equation, would it help velocity through the exhaust port so you don't have to oversize the flange area bigger than required and or does it help with overscavanging problems at higher rpm,just thinking out loud hear,
Anyway anything else you can share is a bonus, thanks

Actually most of my other heads like my dragon slayers don’t back up at .600. This heads vane really messed with things.