[Geoff]

Will be using this with an 850 TQ carb. Getting the 4500 version made it easier to modify the TQ base to bolt on without needing a spacer/adapter.

What I noticed is that the runner dividers on this intake protrude a long way into the plenum. The top of the dividers is just an inch below the carb pad.

Even if a 4500 carb was used, it seems part of the airflow is going to smash into the protruding dividers. Doubt this would be good for/distribution.

Thinking about cutting the protruding front of the divider at an angle down to the floor.

Looking at the Pontiac T2 intake, the dividers do not intrude into the plenum. Nor do they for most Edel single plane intakes for other brands.

Any thoughts/comments?

[RBAILEY]

Originally Posted by Geoff

Will be using this with an 850 TQ carb. Getting the 4500 version made it easier to modify the TQ base to bolt on without needing a spacer/adapter.

What I noticed is that the runner dividers on this intake protrude a long way into the plenum. The top of the dividers is just an inch below the carb pad.

Even if a 4500 carb was used, it seems part of the airflow is going to smash into the protruding dividers. Doubt this would be good for/distribution.

Thinking about cutting the protruding front of the divider at an angle down to the floor.

Looking at the Pontiac T2 intake, the dividers do not intrude into the plenum. Nor do they for most Edel single plane intakes for other brands.

Any thoughts/comments?

I hear what you're saying but I'd be afraid it might adversely affect performance. I was looking at this also and pondered the purpose of this. I think the divider extending into the plenum is a way to effectively lengthen the runner but that's just a guess. I also think the point at which the divider ends corresponds with the end point of the runner wall opppsite the divider and may facilitate equalizing inner and outer runner lengths. Here's my 4500 flanged Victor

[25stevem]

First the question I have is how much power ( hp ) are you looking to make ?

If your answer is less then 700 then don't do a thing in the plenum, just port match the Manifold at the flange if needed.

I know it's hard to resist the erg to do something to a out of the box Manifold, but if you just must do something to those dividing walls then just make there leading edge a fatter / rounder shape while shortening them no more then a 1/8".

This is very hard to do and I find it best to just go slow and use a non taper 1/2" OD long sanding roll.

If you use a Burr it will dig in and yank you all around while digging in where you do not want it to dig in.

Here’s a photo of a very popular Brodix intake for a big cid SBC, look at how far the runner dividers extend into the plenum.

With the 455 with high flowing heads and a Victor if your going to rev above 6000 you need at least a 1/2” spacer added under the carb.

[Skip Fix]

The Pontiac super stock guys use a Victor and Q jet spreadbore. Different folks use different spacers to contour flow into them.

[Skip Fix]

I think years ago GTOKarl(?) posted a picture of his for his street car. Can't even pull his name up on a search here though.Lynn McCarty SS racer has some shots of his for his SD car. maybe he will post his .I know he uses an angled adapter.

[Dave Polichena]

I would leave them alone, at least smooth out the leading edges as mentioned. The ported pic was done by Wilson few years back. I was at 850 hp back then with that manifold.

[jimmy daniel]

The turtle!

[Geoff]

Thanks for the replies.
All of you who posted with pics show the dividers no longer as cast. Rounded off at the top & leading edges thinned. I have had a look on the net at other intakes & I cannot find one that has such prominent intrusion of the dividers into the plenum as this intake.
I realise that the protrusion of the dividers into the plenum area is part of the tuned length tuning of the manifold. But at 1" down from the carb pad & the TQ/QJ having 2 1/4" sec t/blades, the blades are almost touching the divider! Would more be gained from angling the divider like the T2 than would be gained leaving as is for air to crash into the dividers?

[Scott65]

You might consider using an adapter. There is some benefit to be had from moving the TQ/QJ style carbs in the fore/aft direction. I think it was GTOKARL, as Skip mentioned, or one of the SS guys that found gains from this. Has to do with the large secondaries. I have an adapter that I made with this information in mind. If I can find it I'll measure the offset and direction for you, if you're interested.

[Stan Weiss]

Geoff,
Over on Yellow Bullet in the Naturally Aspirated Section - Carb and Intake Show and Tell thread. Posted by ChopperScott a couple of weeks ago.

Stan

[Geoff]

Scott.
Thanks for the info. No room for an adapter/spacer.

Stan,
Thanks will check out YB.

[Skip Fix]

I think GTOKarl just added a Qjet bolt pattern and then blended to top of the manifold.

[77 TRASHCAN]

I've seen a lot of Chevrolet open plenum intakes modified by extending runners (not as much as post 10, though). Those intakes were modified with the intent of widening the RPM range of the manifold.

My general knowledge of using the Pontiac Victor intake is of a pretty high horsepower piece. OK for a 455, IF the build matched the performance potential of the engine. Steve C. Has (or had) such an intake on his 505 street engine. Maybe he will chime in, and inform us of his intake mods, if any...

Jon Kaase used this intake on his 508 engine masters Pontiac engine, seemed like 2005?

I'd give more favor to a larger.displacement engine. Using a Victor!!!

Gooday!!!

[Steve C.]

On the Year One Bandit Trans Am project with a 535 combo Jim Butler used a Victor intake with the carb flange milled down 0.650" to help it fit under the hood. With the cut down intake he used a WFO drop base unit for the TA Shaker scoop.
Tested on the engine dyno at peak power rpm it gave up about 15 hp by milling the intake.

On my current 505 engine prior to the direct port fuel injection conversion I did the same thing with a Victor intake & HP950 carb using no carb spacer. On the dyno I lost about 8-10 hp at peak power rpm after milling the intake flange 0.650".
Not a race deal so for me I did not miss the 8-10 hp.

The only modifications to the intake were a port match to the 2.300" tall gasket used and some blending of the runners. Nothing major done in the plenum area other than maybe some minor clean up.

.