[EDrgr]

In one of the automated ads here, I saw a Flotek SBF head with a peculiar exhaust port. My gut tells me the first thing to do is to grind that vane out, but I'm curious what you all think? Intake vanes are fairly common, but I've never seen one on the exhaust.

Thought?

 

[000Racer]

I've seen some of the fastest cylinder heads in the country.
Not one has a vane in the exhaust ports.

 

[scott foxwell]

Old school BB Chev alum heads had vane in ex port. First thing guys did was grind it out. It's just taking up area.

 

[69427]

Old school BB Chev alum heads had vane in ex port. First thing guys did was grind it out. It's just taking up area.

I knew I saw that years ago. What vintage were they?

 

[BBF612]

The NEWLY designed THUMPER 180 features a raised "FLOOR" and "ROOF" design. Why you ask? This allows a better approach to the valve when attempting to achieve high performance and to keep air and fuel attached to short turn radius for increased torque over a wider RPM range without sacrificing high RPM power! Coupled with NEW CHAMBER DESIGN for better wet flow quality and a NEW "W" DESIGN EXHAUST PORT to keep flow attached to the port floor which greatly increases exhaust gas evacuation verses original 180cc design. Always thinking of the racer, our FLOTEK THUMPER 180 accepts stock manifold!

Small Block Ford 180cc/58cc | FloTek - Evansville, IN - Store - FLOTEK

<p><strong><span style="font-size: 28px;"><span style="background-color: rgb(255, 255, 0);">This item is not sold as a pair, this is a single cylinder head.</span></span><br></strong></p><p><span style="font-size: 28px;"><span style="font-size: 24px;"><strong>Please select a quantity of 2 on the...

www.flotekheads.com

 

[BBF612]

I noticed that the 205cc head has a raised exhaust port and no vane.

 

[scott foxwell]

I knew I saw that years ago. What vintage were they?

I think they were the 861 casting Bow Tie heads, probably 80's-90's

 

[1963 corvette]

If ssr is right nothing going on there anyway. That's not port area I would be changing.

 

[Bill Diehl]

Years ago I remember seeing the Lee Shepard exhaust ports on the R and M Pro stock...skinny long rectangle kind of like a 2 stroke exhaust chest...thinking WTF? that is the current tech now? later in life I learned it was where they drilled the solid heads to get water in and welded them back up.

 

[Chad Speier]

I've seen the vane on exhaust floors, it was to take up volume. Super Stock stuff. You can learn a lot from Super Stock stuff.

 

[EDrgr]

The first thing I thought when I saw them was marketing ploy, but heck, I thought the old TFS Twisted Wedge heads were a marketing ploy until I started getting beat by cars equipped with them.

 

[Chuckles]

AKA "lump port" heads.
Have seen them on 6 cyl stuff....

 

[69427]

It would be interesting to hear Calvin Elstons thoughts.

 

[rb0804]

I've seen the vane on exhaust floors, it was to take up volume. Super Stock stuff. You can learn a lot from Super Stock stuff.

Is that to keep the velocity high?

 

[Chad Speier]

Is that to keep the velocity high?

No to make the port bigger then shrink it up to rule.

 

[Mummert]

I've seen some of the fastest cylinder heads in the country.
Not one has a vane in the exhaust ports.

Were they stock port location?
It mimics raised floor with stock location.

 

[hoffman900]

Looking at these exhaust ports, it always makes me wonder of flow is exiting the port perpendicular to the face. Most headers are built perpendicular to the face.

I have read that some of the Super Stock guys are running smaller than what rules of thumb would suggest exhaust tubing to shifting the tubing up and ignoring the dead space in the lower corner of the port.

We know from Alfa Romeo ports you need to continue the port straight from the head face before turning it.

 

[hoffman900]

Lots of good snap shots of an exhaust port here:

 

[Warp Speed]

Lots of good snap shots of an exhaust port here:

View attachment 464042

Brian needed to fix his collar! 🤣 🤦‍♂️

 

[hoffman900]

Brian needed to fix his collar! 🤣 🤦‍♂️

My wife would be roasting me still if that was me😅

What do you think of the CFD shown there? I know CFD is only as good as the user and how you calibrate it, but it is an extremely useful tool once dialed in.